Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd64052f685bec0…

MALICIOUS

PDF

80.7 KB Created: 2021-09-04 01:12:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 308f712ed4584aacfeead4375fd0f8e4 SHA-1: 3a3f0abb04caaa2b5eb31b35b9ada888fde0ee1e SHA-256: 6fd64052f685bec00a2f5458176ebfcd0e2029a7daf3c420caeb7aa667df9310
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm pointing to compromised WordPress sites and disposable hosting, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://drafthe.ru/uplcv?utm_term=lodger+agreement+template+pdf PDF link annotation
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121985878c65---27208234077.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/papijisaxuvanaxinakesegi.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630335101.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160919e8abfa4f---90788912626.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/webizedur.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/dixizojuxubuzixijamorige.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/bidetokuxarufuzuro.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/remopipupamitikene.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/jenabat.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/devovumizurumegijilo.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8b0c48917---15878005759.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/32845969795.pdfIn PDF document text
    • https://mobilieroccasion.fr/uploads/file/wojetasigusojanepo.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/91521679354.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/pinezudakogaxesulowul.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f806dcfcce0ad4af6fafa51970677c0c/senulasavorakoragopin.pdfIn PDF document text
    • http://www.vishalsahni.com/public/ckfinder/userfiles/files/38301999214.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/68593355589.pdfIn PDF document text
    • http://nifaelectronics.com/userfiles/file/70291389150.pdfIn PDF document text
    • https://journeywithmypet.com/ckfinder/userfiles/files/vapobibobixax.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/60cfd31bc17dbbe4757a66097be9b65c/45619572195.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/lowolozekawevukabi.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1630657303.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_off0000d8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F5 10536 bytes
SHA-256: 730ca28746454f6d41534d4cd2f510c52f5fe04a65e4b4c52eee8e0fb8e68986
font_01_sfnt_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 17424 bytes
SHA-256: d689fd0ed3c60a6953e7b391dd4d1c9cfa1eeb4ca33d595b34f1ffab694cba81
font_02_sfnt_off00011d6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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