Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97c5dfdb02cfd03…

MALICIOUS

PDF

80.1 KB Created: 2021-09-04 10:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5e6df78eb72a393069de1f63286eae5a SHA-1: b61f032de7761554dfaf009b15a0ab31f9584d90 SHA-256: b97c5dfdb02cfd03cdd7a894cc0525a19aec88a217b306f54b9092847b68dc16
216 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, potentially leading to a password-protected archive lure, a common tactic for evading gateway security. The numerous external URLs suggest an attempt to direct users to malicious content or download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ketchas.ru/uplcv?utm_term=prentice+hall+biology+online+textbook+pdf PDF link annotation
    • https://landi-bg.com/images/file/99294301184.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/62475060039.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/kejuremusosaba.pdfIn PDF document text
    • http://asvpp.fr/pdf/75753838997.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/10745649215.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c965c33ebca691e4e1ad895ffdee5c4c/22154151795.pdfIn PDF document text
    • https://synersys.fr/contenu/file/sepoketelajutoboje.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/31910506696.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/4dbe057e838960aa1b4b06c981235077/nafojodazazixok.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/8c5b5b0784bcced2efd83cf23f534c02/11073485530.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/lokifaretavugivilixewig.pdfIn PDF document text
    • http://4bx.pl/public/file/gimakuzizido.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/18825178961.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/wipidoxigijuj.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909094f1268---92790279697.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a61b91a0490fd290da7fa86fd36cf9a/14095151923.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/vixakidanokomusupomuf.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/66165927653.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a63b34d8---fibaxigiximikuzo.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0233ad283---wajusuzomelozodakikuzibu.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/wobesorajobopewanija.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/49002722721.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/rubatisunu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a926cacc0b---10432444840.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730d76055c0---11077555139.pdfIn PDF document text
    • http://goref.ru/files/file/61204309735.pdfIn PDF document text
    • http://krzeptowski.pl/file/wawowovesape.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_off0000cf8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8F 11180 bytes
SHA-256: e51ed23e7d89a66d54a356879d5848ea50c48495f896894b4f1f1e57f2141b98
font_01_sfnt_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010154.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10154 18976 bytes
SHA-256: bdb6453f2358ddb2e47fe91c3c369893ac9f966a4ec97ea5b26f870b91766707

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