Malicious PDF — malware analysis report

Static analysis result for SHA-256 67d1dfa5c5461a5a…

MALICIOUS

PDF

109.0 KB Created: 2021-07-28 07:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ce2e2550636ff09a9dc3f82d13ec172b SHA-1: 642c95493966e88d37884dd90a42d2feee53efc2 SHA-256: 67d1dfa5c5461a5a396804a59882ea3a4bd8393cffe18debdb7ab792ff9a073a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs point towards a malicious document designed to redirect users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • 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.
  • 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://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/5hjj957sie9bc256rfa956akh6/70794066507.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609243141c84f---81593008987.pdfIn PDF document text
    • http://bigandtallking.com/userfiles/file/sisurexivavufulelixinijad.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/81571920717.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160778955544d8---72214397157.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/92089700699.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160abcdda44cfd---48337236223.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/kr0j2djjpbas2mstlb2o7l3gem/zibixu.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/ip6sl70nivoa1ga2v8b53r7739/95129094082.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/xovovejokeridufomonu.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/bacpjpfhl99u2n2vfqviqpo8g0/tuxezurodugajiz.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/32f458c5ba1852af41517924bb6b05ab/17794405121.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/setemevujakovekebur.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f10d9cef428e5f4d4c10be70affca860/22144910321.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/57680839284.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608729a31e312---vatatabakujedowimekalij.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/5f27d49712fa1f3eac9abe717e7f26ac/32927069753.pdfIn PDF document text
    • http://isystem.hu/ckfinder/userfiles/files/64252978074.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/81007016964.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072dc3327b6e---97622630357.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/52727993873.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/202171754265924.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/h5kufem4qfebuduadl2g29sc1c/gerafexerowokixumebipefal.pdfIn PDF document text
    • http://fairway.cc/images/blog//file/52979483392.pdfIn PDF document text
    • http://xn----8sbfeahwarn6ac1adp3fb2p.xn--p1ai/userfiles/file/zuwoninobonumuretisal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ark+alpha+raptor+z%C3%A4hmen+modPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA7 18248 bytes
SHA-256: 63256fd17cb8b72ca51b3b44500125db183177ff641c596e432b73ef7f6cccf5
font_01_sfnt_off00015d75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D75 10784 bytes
SHA-256: 5c21e4b4b93676a60b5c4ddac2732684da70852fea81e6e8581203c7ecf5ed49
font_02_sfnt_off000175ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DBE 16364 bytes
SHA-256: f6f90882c41d7bada05659ae46eee08499c7958e7906b68d95350870fbd553e2

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