Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb8c7a11d0e500b…

MALICIOUS

PDF

94.0 KB Created: 2021-07-02 10:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b161ebdf2c5f5832851b429ee21f3aac SHA-1: 152669052cf56f9bdd872c9617692b467ee363b1 SHA-256: 7cb8c7a11d0e500b37d3cb8044be883cdb355db10ee461d05a031ca813b89e71
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/29473d689fc4d16da99d5cb85ee24a92/26932001628.pdf In PDF document text
    • http://stattus.com/assets/file/23677681845.pdfIn PDF document text
    • https://memoservicesrl.it/file/gavidopavunuzovujizi.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c791b26c86---11470913955.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/66262903867.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/9232077273.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/m3sip768jk0vscv0dl2pfi91t3/vukuwozuzugerimexokijala.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55a51c5b2---segexukodepevowasute.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16081d82940097---39258286044.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/98163275868.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/s5n6ep2rc369qe4frnn1usf6o2/zunirilivabipuzuwu.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/xusekodipubefi.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/15409610543.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/jopapenimufuf.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/kivazobosafusenuxos.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/13706002749.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/rexivisomuzafulimudufi.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609aed6a7eca4---53415760679.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/pufapuru.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/dthh9946ujq9es8p8lhgo6l05s/vipazut.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16073ec6520dec---posozevibirari.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a08cee531e---17591188846.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b7fff9d9da63aac3c0e9ad923398fbb0/97642892670.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/56da1a4366fa1fd95c56bc276d9c8f80/23559368826.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=informational+writing+prompts+with+articles+5th+gradePDF 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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 17360 bytes
SHA-256: 3eec1fb71cc0b15135266ec69e53fe3fe7414dc2f8d151a1251ca310d18b0345
font_01_sfnt_off00012072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12072 11236 bytes
SHA-256: bd8d38d8dd806c3e2c1df543893bad9b052cea37c86b94291cdeb89728f5a41a
font_02_sfnt_off00013a7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001528d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528D 16140 bytes
SHA-256: 00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b

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