Malicious PDF — malware analysis report

Static analysis result for SHA-256 83563f9beaf5dae0…

MALICIOUS

PDF

85.9 KB Created: 2021-08-08 16:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2c59bf2428fdb099d532643e96c44b79 SHA-1: 0bd1b1188867d9f8709af0d665ab47c2d1ee5c27 SHA-256: 83563f9beaf5dae043691f9d45912b186f9f19584c7adfbdc06409c2151198ed
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/f5ba377fef6c6807401892631bb3d727/47616813384.pdf In PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/28019784267.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/58697271177.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/bqv97u52beog90nomm83j1fqqo/84217160258.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/viwexalibarurusufiweludot.pdfIn PDF document text
    • https://davaocarrental.com/images/file/mikenufiwewazed.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/jubimikofiti.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16087f110690b1---86021278800.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/8923861856.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/wiletolutirutapisudowuzam.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5df8ddb07---37229181362.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/guzenerizo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160862d0861f71---gulagejedazisowewugorive.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/32240536867.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a0ab62167f---fozanebuf.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dad28574---17362993462.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160dab665897ef---sakuxewitewidurolawogoze.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/74504031700.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/20363441885.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fb956c15a---zizudupediwakowogavifa.pdfIn PDF document text
    • https://uniontend.com/userfiles/files/20315599922.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/95697079893.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6e1a729f2d---ragavozavufopu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=texas+free+chat+line+numbersPDF 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_off0000ebab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 10788 bytes
SHA-256: 0070039ca4ac3c2381629ce7606b1630fb3647c1076b2d3f0cb41a6fde5e5d47
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 16968 bytes
SHA-256: 05e32bd85035a8d89deda28aea71759ecb9927f3608602307edafeced752eedf

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