Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a640045bb36528a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-06 15:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ea05a129509123fee5e9c0af0ee02402 SHA-1: 5609be4578359d48124d52136d788773d45d4952 SHA-256: 3a640045bb36528a3dca453def1afe376b86cbaaa21f36bcf3b633c16dcbe224
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure indicates an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20da3d172---31773429763.pdf In PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/b7819fb903034e2dee9531fffce6f41f/jerutajudorawonu.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/89631263951.pdfIn PDF document text
    • https://stvorki.ru/files/file/pasilobuduxeb.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/vorulanewiwujevowenorekep.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/19858872093.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/70783670211.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/59119551585.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/61287944273.pdfIn PDF document text
    • https://paron-rebondir.com/uploads/files/rukoravijupalikawura.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/36256915569.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/fujimuw.pdfIn PDF document text
    • http://jsdarvin.com/files/sujukemanipaxuwapimunesu.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/5f3f9d14e0e6649f496625e06911c37d/93027406367.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/a7182462068eac2bf7c8ee779a3c1e8b/13287649091.pdfIn PDF document text
    • http://gamaxmotor.cz/data/dokumenty/vikogodawamulo.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/94908941326.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/d9d3d5a547f51d2ca952b6c8e7b1c7fd/43344168562.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/56042061105.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/jevowoviwojujeporif.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/wugevud.pdfIn PDF document text
    • https://maintogelonline2.com/contents//files/20120481165.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/jufudadagalixobozena.pdfIn PDF document text
    • http://salt17.com/userfiles/files/benibu.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbd1e41483---juvobanelepatu.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/61703346020.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=chm+to+pdf+online+conversionPDF 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_off0000b626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB626 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE38 15536 bytes
SHA-256: 7967d71a1624be1951273801102023ee4992e868f1e23c0c985d0cf385897b50
font_02_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 10820 bytes
SHA-256: e2e8a2b4c90db153bbcc2c4c705933e63ead646834746a2ef76fb297d08560f2

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