Malicious PDF — malware analysis report

Static analysis result for SHA-256 72623b9d29045e76…

MALICIOUS

PDF

87.3 KB Created: 2021-07-25 03:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e241b1ac7b2980be16dea1071b5e6c04 SHA-1: 61ea03cb3e2cc773a99516a0d619ba16f4a0c2e5 SHA-256: 72623b9d29045e76410a531245476aff7933e21fefd9cc7c124410c9d66b048a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of external URIs and link farms on potentially compromised hosting further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/416d651864dfd14268a8edf6ef674803/11173557274.pdf In PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897e45009f5---6277814929.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/65350082340.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/lupizijoserebapa.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/rulixajexo.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/22477445fdcb2bcb1c70c5d9a00fc5cc/32563345461.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/patavirirafa.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608405c2a83a0---vabafe.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/muditaxunejitezotivas.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/e1b043b9ac0d7c817175319ea7e6674d/67889394776.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/5137773321.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/516a7690728468a7988fafeaba547250/nilarepotasolubufago.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1205a28b6---85034668804.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/df7dff0020fa7a5115e0facddfd9b6fa/14078081995.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/84509534228.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/turavogonulili.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a19905e28cd---5621979027.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd1362316---kexigenumufowi.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4320123c---47645867496.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/newomiferebujazazu.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/r9l9nbj7pho8fp7rjj6nt4s753/tuvurekomofivan.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c8aaa1015a4---datenotejunafiwate.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/58471620389.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160875078d1075---kigolakeparosavibif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=adobe+lightroom+cc+2020+system+requirementsPDF 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_off0000eec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC2 17668 bytes
SHA-256: 5ccef1d4786f7580ccd083ca1bae2ff99f693c5956516779d78b1229d6c2d38b
font_01_sfnt_off00011d2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13541 11380 bytes
SHA-256: 74b47919a5c1f3c2e4ce40cb54bc111ad9b2e647d36597667fea6b130beae4ae