Malicious PDF — malware analysis report

Static analysis result for SHA-256 df01c513b881df01…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 06:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c2519f5c7a91b45b1be77ef3feb1108a SHA-1: 2cd4e0ccf9000572258572e6664b587c059807f6 SHA-256: df01c513b881df01056ec5c983c8a9de976806f35d19d96a1da3200e6b2e008c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many of which appear to be part of a link farm hosted on compromised or disposable domains. The presence of a callback lure heuristic suggests a phishing or tech-support scam attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cructi.ru/uplcv?utm_term=asphalt+8+unlimited+tokens+and+credits PDF link annotation
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/guvunazutobani.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tupudufozu.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/28513812360.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/64874960707.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/24344992189.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/53919992937.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/67766189998.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b3a0702ed---vamolarer.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/63851212599.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/teronu.pdfIn PDF document text
    • https://faceless.me/userfiles/files/10247990667.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/88701308654.pdfIn PDF document text
    • https://campermagazine.tv/public/file/56071939560.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109171312586176.pdfIn PDF document text
    • http://wawa757.com/uploads/files/21926040159.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///21561163591.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146cad7cade3---7233106561.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/44d1b0a17f0af70ecf90e50a58c6cbf2/61295132121.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/29846020936.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16149071fc03d2---golarevubu.pdfIn PDF document text
    • http://daiquangsico.com/img_duhoc/files/domirabevofesemebefalodi.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfc45c007a---fabodedimene.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/zizoxubodegut.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/87974492265.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kinilazelakumi.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_off0000dcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAB 18172 bytes
SHA-256: 07039233823697b8ef078e8c309d1980e74c25c499f7ddf25f939fbf5ebad9fe
font_01_sfnt_off00010bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001240d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240D 11160 bytes
SHA-256: df019951107384397d44ba424b50a6fe628be72481c09a7413a3884e5e9a7a91