Malicious PDF — malware analysis report

Static analysis result for SHA-256 86125b4b43cabbc5…

MALICIOUS

PDF

82.5 KB Created: 2021-10-06 08:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bf3d6db925e390c2bb88707549819d5b SHA-1: 203f4331673a01d6f91074c1ca36d49abb86d668 SHA-256: 86125b4b43cabbc5eac4ac517a51722349230d31a6bcace1931d178da4e010df
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which appear to be disposable hosting or compromised sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to act as a link farm, likely to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mansiya.com/uploadfile/files/94229046529.pdf In PDF document text
    • http://baracenter.be/userfiles/file/rijep.pdfIn PDF document text
    • http://mrpokedb.com/uploads/files/33820854898.pdfIn PDF document text
    • http://anciensite.ville-rouillac.fr/docs/file/xasalixulepimax.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/37482035863.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/m1u0fl0oujvelo3ut40akr2v82/46654176020.pdfIn PDF document text
    • http://smileorganic.net/smileorgfarm/filesupload/File/zivegidipin.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/lodezizopapovuwixedelu.pdfIn PDF document text
    • http://asclyziarskyklub.sk/userfiles/file/nusubafovozag.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/65201860672.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/62854582026.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/biposaz.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/warogof.pdfIn PDF document text
    • https://tessuno.com/upload/files/6131adc467a0e.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/vafuruj.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/73193ea427eae9261f9d8a94e29b884f/24143037376.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/31216410921.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/98508678574.pdfIn PDF document text
    • https://christschoolblr.in/userfiles/file/72029840648.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/6614708543.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/ridesasi.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/1n6mp883aeb4b8mugbbr82n7pj/58883538964.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/fa4bde70410d965f428787bab53cf3b8/97543758769.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/81303036112.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021092303310126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=coming+to+an+end+meaningPDF 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_off0000dade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADE 19428 bytes
SHA-256: 4a1b0cd38a4bb446660eba9bbed8f784f0908e19480a8a973ad57ec5f7b3fbfa
font_01_sfnt_off00010dc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC8 10308 bytes
SHA-256: 1e7b3248db09afd44dd1a4678c26c9c957bf25ec3b1145ed9d3f63c523826b75
font_02_sfnt_off000124c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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