Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21a6c47cd4a6e05…

MALICIOUS

PDF

83.7 KB Created: 2021-06-27 02:58:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5e85ebb93482bd97448790e8e5977682 SHA-1: 1d509c9586fb155122696bfda22214af8d33a864 SHA-256: c21a6c47cd4a6e05d3a9d97710dff235f3ba6e41d443c9c8f92639256ef8d7bf
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is part of a link farm, with several URLs pointing to compromised WordPress sites. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick the user into downloading a password-protected archive, likely to evade gateway scanning. The 'SE_CALLBACK_LURE' heuristic further supports a phishing or scam pretext. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f817b292---jimebakamepizupose.pdf
    • http://ngor2-3.com/file_media/file_image/file/nebax.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c12ec67873d---fesabulukufu.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/j270oddnunn8h43b08jgmkei0o/77382880341.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/eunt7hsp26mgcm19fribr4il38/kexarudob.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/acb7ml3h4geu8j2qpol1jpjva0/60776273694.pdf
    • http://nature-revive.org/files/file/jemat.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1180974e8---xiwizexevix.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756df845987---famebeg.pdf
    • https://marosme.ro/hirek/file/15682786409.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079439665dbe---19050735581.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/mnb2n5jiqpc51e3k7b5nfo7h06/vireroxonovifotu.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf30074f4---89320234720.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a50fd40b224---92562008606.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e404cf86f---lakiziterigod.pdf
    • http://kstarsmall.net/userfiles/file///41369469331.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/302860f4ec73e09bda79ca6db7157d97/jixebusaverejodap.pdf
    • https://asthasupermarket.com/userfiles/file/12883775365.pdf
    • http://jyjwqj.com/uploadfile/file///2021060409462265.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/1e7fb943b6f8606a0bfadaee55a4ccbf/wakapidiz.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/cc28207407a2b087e88669c650e20b2b/61134762334.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/ke6tqjvf5m3s9mcgadbsv27tgi/gamobiban.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=tell+me+about+yourself+answers+for+customer+service
    • 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_off0000e1cc.bin
bd87cbca9d2a21930c8ae1f4f43366587eb97e082e0a663a9bfc445fe779ee30
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CC 17484 bytes
font_01_sfnt_off00010f98.bin
57bc2c0d9c62b5fa1e96a45aaf33ecfa767a1f9f25befe5fdc7dfa67a515df2b
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F98 10968 bytes
font_02_sfnt_off00012926.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 16792 bytes