Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dd4407678c3e1e…

MALICIOUS

PDF

83.0 KB Created: 2021-07-14 02:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9182b4355e0f197a7e9970eced76b1fb SHA-1: aae720537fe53a6e279857364b85fd3f9eb55935 SHA-256: c1dd4407678c3e1efcf9b74d9d7f069fd71646bd286bd255cf7ab9dc7f9c01f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a credential harvesting lure. The document's structure and embedded URLs suggest it is part of a link farm designed to redirect users to phishing sites. The presence of MFA/one-time-code lure heuristics indicates the primary goal is to steal authentication credentials or session tokens.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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.
  • 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://mabuksusu.com/contents//files/mulude.pdf In PDF document text
    • http://geyikkimya.com/userfiles/upload/file/39293563148.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/24f90c4cdf925a420a63138e23b9be9a/54337119157.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b11fd509531---nurejetiwevuxujusoso.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/f21d2c4fc481d7a980e581477264c61e/99509986114.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/671b06167be3061c9df4c2c8edd7f048/firawexes.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/15551659865.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/9ac4a5554ba6a4fade120338a8074050/tukapalazuv.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/8446d31cd126ec75f69f4a73fec1ab7c/23793852638.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/16303409932.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080758a8add1---fegarovevokubabemu.pdfIn PDF document text
    • http://wojno-stal.pl/pliki/file/70593518164.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/44501844632.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/34423811063.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01d4c66941---20615322071.pdfIn PDF document text
    • http://microlana.com/ckfinder/userfiles/files/90046169447.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/nsgkjensjsjrl875vl5862fpk7/mejewaguk.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/zedebujekumedeginonom.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d04b6b173f---98846296693.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/j78alo5bhnv3lo9f46p64s1e33/32901740587.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/jazalelet.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bed801df0bef8c873d4aa4615ab4ab72/ditadexalazaledetefi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=wynonna+and+cactusPDF link annotation
    • 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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 19392 bytes
SHA-256: 8b2cde6e36490189f304998c91f6b9133302ad1498fabddf89eca8aca5887b6f
font_01_sfnt_off00010feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12802 10200 bytes
SHA-256: 92f883b4c034dbd3e22d5e251778937ed601610d75c05716c154415687310fe3

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