Malicious PDF — malware analysis report

Static analysis result for SHA-256 345db971e9b2499c…

MALICIOUS

PDF

97.8 KB Created: 2021-09-03 19:58:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 91d44cac45e943a1cd8db297b2bece97 SHA-1: 8ee177a1f9724a1cb1418c0edbf4e2f709512b89 SHA-256: 345db971e9b2499c3b501985a5307ebe73a882a5637fcf1c5778568c63158bb0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or tech-support scam. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The 'SE_CALLBACK_LURE' heuristic specifically indicates the document prompts the user to call a phone number, a common tactic in callback phishing schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://chcial.ru/uplcv?utm_term=mcgraw+hill+ryerson+physics+12+pdf PDF link annotation
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f6ca4cc3---palil.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/13735404153.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/88506587763.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/63349403205.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/dovuzogumizituruvevi.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/14401ffedbc9bb2c31e21ac858e6f6e5/nomorugefajodipi.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/ludipimoxemoke.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/9668e5db46437d68fe90ec34a80da7d3/redadisud.pdfIn PDF document text
    • https://summit-christian-academy.net/scauserfiles/files/kisusuxaletebiwebo.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/muxurukuw.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/12415919593.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/53888040604.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/dapojifipa.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/rajuvirawararovapukuz.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/gixewoliginokunirewefama.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac535d7c452---guwebimezilebidibumavuz.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/38617587686.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/nigemewikuritedeziv.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/pajokifosogo.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609736346498c---64861869248.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a614b6f7ea9b3ff0d2c101e03b75a9e4/vunipikinovu.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/afbeb4c50de6e17c99c188d1bce3cd3f/11381888677.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/4gep6p4820a4q0qcljhdq6chr6/livoresojumij.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6bca37a5---bamutasikeburojibokabim.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/40945970592.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBE 11164 bytes
SHA-256: d1fe61946c3118ab5f642b98f118e14344b71a4142d140a9bcb2d0a427552427
font_02_sfnt_off000149ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BA 18488 bytes
SHA-256: a66987c5eaa90f904f76b38d8f1aa1fc0f79462c04daff4283bb1d07db210295

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