Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b5442716c9fa9a…

MALICIOUS

PDF

82.5 KB Created: 2021-07-24 00:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: edd49695b2fe26f9e1ea2fa73d5871c7 SHA-1: 50111ba22b83bffba5614dcdf6299b6cd2ae001b SHA-256: e2b5442716c9fa9ac4f21c363e1ccea33c202f7c222c36b12e505c971549a040
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF identified by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates a potential phishing or tech-support scam context, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/408504de51c80e0558bf292e260c4a3b/20113541937.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d4cb89172---gijasipuvo.pdf
    • http://busangh.com/attfile/fckimg/file///20210620234538_981284990.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c74c6eb7d65c72893c5ba5054e3f3285/24597093153.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088600702429---47667965990.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6b697ea7e---nopuv.pdf
    • https://zaragozadenoche.es/upload/files/fonasuzobagevaxivusi.pdf
    • https://adikkeempat.com/contents//files/zatixaradolazilum.pdf
    • https://sedefartphotography.com/resimler/files/22216125131.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3278ed2b4---19151659935.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/4a68995052896f556bf105a7ed8051ad/tewetubirajubefopizim.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/1f81f927f47b551492174d2e10dd1cd3/korogaz.pdf
    • http://www.hydro-tg.pro/upload/file/gojowekunewosom.pdf
    • https://lose-weight.tw/upload/files/98126790016.pdf
    • http://dblbtech.com/userfiles/file/96620767180.pdf
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/ac4a51586773adbe18dcb09cee49fbde/27027957412.pdf
    • http://mytmbc.org/fckimage/file/famibefilur.pdf
    • http://modnyi-buket.ru/uploads/files/70841482758.pdf
    • http://studioarchperissinotto.eu/userfiles/files/fepugosabiwa.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ede3d3f2f2b---tupivo.pdf
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/bolavatugopudabavuxagupog.pdf
    • https://www.medicalbi.com/ckfinder/userfiles/files/ranasugegifot.pdf
    • https://nnkcreations.com/userfiles/file/49365074197.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=convertisseur+pdf+en+power+point+gratuit
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3b8.bin
8d72f4bf906243f744411d35d83eed4e40ed49602fae5489a99e6c818cefdbb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B8 10912 bytes
font_01_sfnt_off0000ed05.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED05 16792 bytes
font_02_sfnt_off00010517.bin
5d9a84e991f41c5098256420005e3cb78d725f4b304101496818b4c11b6eb428
pdf-font-stream PDF embedded font (sfnt) at offset 0x10517 22436 bytes