Malicious PDF — malware analysis report

Static analysis result for SHA-256 352ad68dff6b4180…

MALICIOUS

PDF

94.5 KB Created: 2021-09-05 12:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 08763b15c40e8d71ce4ebf713d383b23 SHA-1: 481b36cd12b971d33a1b41be97bde054c66378ee SHA-256: 352ad68dff6b4180eafd62e638a629e7279f9187beb4c76689060e1db5be2439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pistant.ru/uplcv?utm_term=machinery%27s+handbook+pocket+companion+pdf PDF link annotation
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/f78a1186a7dbedd82f603cf50baa1518/lowajag.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/88b4cb40a51b29744e3ae679ac216d30/57206417243.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/70172447a56108c63b825d5f9fd0b87b/21064096851.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/70fc37a4f0c3c9ee72cf701d35b057e1/70428305289.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aad13148598---tumukag.pdfIn PDF document text
    • https://krossi.ru/images/content/files/11825672699.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/popadozaxufosofukibuzavil.pdfIn PDF document text
    • http://zaiger.ru/img/file/4675663499.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/jujepopabelazazuzevexuzi.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/75434281411.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/pofupokuzakevuso.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/57454878099.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/9pv4uhtk5kbfrj0leg0ld5qhof/81733219547.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/31117447551.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/69bd9aqnsdu043o9ut53265ln4/nisimufibebakasuvim.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/bd043719839474ca45a95fa9c0c89d3f/947870089.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/gumawedakonakopidubulozo.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/xewufegixukopodamo.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/vabubevopifetawavidefo.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee3dcd0fc05---zuxalaranorujiboval.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1608a713c931d3---82218099226.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/56532420845.pdfIn PDF document text
    • 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_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 20120 bytes
SHA-256: 16c355672438b9ae567294a3d00548964c796bee1cbed571b3c7b6c0281988f7
font_01_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 11212 bytes
SHA-256: 246d1a5118bb22a198329c37126d0b5bc66eab9fad7cfc08e4d8c1962f10061a
font_02_sfnt_off00015454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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