Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fbbb73b92f4c75…

MALICIOUS

PDF

96.2 KB Created: 2021-06-28 07:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: e3861816d409dfecad011c20cd3046a0 SHA-1: 239561118668ed1cfc59a90ecb01032454213075 SHA-256: c4fbbb73b92f4c7536c05b173af611193070467e0bfd8c3191a5d2e737f7712f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which are compromised CMS uploads or disposable hosting. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, consistent with phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and heuristics indicate a high likelihood of malicious intent through user interaction with embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9825

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lawrence-spruill.com/clients/42275/File/vutonafivuw.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/m84lopd9i1d8ctmfhmloat3md1/98717498652.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/0c26be3c513c412bf04952cee9c59dfa/xuxosapagugeduwuwa.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/niwuwesupoxo.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/48928528259.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609049ea3dd11---44820404443.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/b3c7c731a9120c59b50bda691de2dcca/babubinatuxamukebamag.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c61ee4b459---vefusi.pdfIn PDF document text
    • http://shreejians.com/userfiles/file/10048867509.pdfIn PDF document text
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/5fa45dc67b642f55ecaf33aadd30dcd6/93270650214.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/50455394662.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9808bfa34---kilujaxiwovododobuwarini.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/jabepurevimopikibegora.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210526/file/56075914413.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b48f336eed1---52633282937.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/17364933191.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/5f82fb5050d634ca5e7fd0db61b61ea8/lunukosidijipadinedexib.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a83e0532---48095864761.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ea22e9bee---82166762147.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/69jaf7mr8m82f9c0cpeufaq865/xatavutoworedobe.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/bhl0ks2df2ub8cbkmnjheosnbd/4043422541.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/0a41814d275caba3972c082a2304e711/puvonuxapobavevoka.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e182065885---97073526074.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/9b4cdb06db7374da46e84141da8f1711/3799535389.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81be97f14a---64846877601.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=overdraft+and+overdrawnPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015563.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15563 17852 bytes
SHA-256: 25546d96f4fe1ad6db20f8c55b7c14416dbb1ca47acc9be7ceb10144b3f7bac0
font_00_sfnt_off0000e98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98C 19728 bytes
SHA-256: 698b21c25fed8554cff518a413ea47b5a805354e7f5f9aba66e7e922080a57ef
font_01_sfnt_off00011b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B85 10216 bytes
SHA-256: 3abeff28f7b0de5ad3f64a40821337394b9a0a84027d85c72881832c732a0234
font_02_sfnt_off0001329c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329C 2440 bytes
SHA-256: 96bd66719760109313b328f218e7b854ae9010f1dd9ac70813ec5a6867d27645
font_03_sfnt_off00013d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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