Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c8a550d1c5ff0f…

MALICIOUS

PDF

78.4 KB Created: 2021-06-18 23:26:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f222dbad236e2ce6107790516b9205b SHA-1: 5ae103c269c36144e0bc6ae5296b3d2f8c3fad90 SHA-256: 09c8a550d1c5ff0fb2f19337cbc8158cb2b95bfd2e882e6e85c023b83e67b33e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure related to 'iphone icloud unlock online free' and is flagged by ML classifiers and ClamAV as malicious phishing content. Heuristics indicate it functions as a link farm, pointing to various compromised websites and potentially disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs and link farm heuristics points towards a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://apexhealthnutrition.com/newerac2c/userfiles/file/39925094149.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d31764fc01003aa372503b9325d51bed/3404769940.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/8c07face582260c03d44814598539693/tujelanujeratemanadepiwob.pdf
    • https://cottonweb.net/userfiles/file/16136367454.pdf
    • http://alarmy-kamery24.pl/userfiles/file/jixajomat.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/d734a70945a623746f0dceec09d3a314/batodojemutigul.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ad3984402955d2f457c4231d38c27c3a/50495146071.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tng7bqbbp6bh3h7a6jk1o32pj9/63530395276.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fcc0b9403---10882851628.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/1ovlge2tu6ukg8qi4f88u27fkd/kiwajowori.pdf
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae1db077e---gogora.pdf
    • http://nedirajtebosnu.net/userfiles/file/57185393655.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084765289f99---zazumofexotesirodat.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092b106f0080---50885125463.pdf
    • https://allcreaturesinc.com/files/files/xugotutaredidedukafajo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=iphone+icloud+unlock+online+free
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8d7.bin
4fdae37ba2925830f7d3f4e0d812ffa30131023daf7d5a7570dc6570749f1aec
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 4856 bytes
font_01_sfnt_off0001095c.bin
917cc49e04bb4be183592b3148c9f3369bea7f1d96de2f77a349d7d3e1e12699
pdf-font-stream PDF embedded font (sfnt) at offset 0x1095C 10440 bytes