Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e794e8e23c190fc…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 02:35:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5045cade40e43afd800632f078b21e3a SHA-1: c2a8b5a3eec7b6c3d14a35ea80bf59bc216750ef SHA-256: 0e794e8e23c190fcc68862baffc04a974cc5bfe8450bb547fecb1c57aad360de
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://qian-ho.com/upfiles/editor/files/belolowilozimakoreviw.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609d49e7068a3---25485216538.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/64duagj67pbtomabvql8h7aton/medan.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746c95a14a5---tafujasevemikeja.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021060513334841.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/82650560929.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/8f9a4e7bf3069094794fdd3585e8b195/45463963241.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/cacaa4ce4c951e3af3a5620eb9c5a01c/vijexefaz.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/8561480209.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/do01c5ms314g4h4vrg420cj1e8/semudutusumag.pdfIn PDF document text
    • https://ludbaegitim.com/calisma2/files/uploads/18518095763.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3083b969c---85850799205.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610336d32ce23---wajogaraz.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/fdencg9hs7qe6faclupc2eoi0l/86123907082.pdfIn PDF document text
    • http://carlaschroyen.com/content_docs/6289530794.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/miwafafuwimav.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/74775753293.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba9b4db8f61---nizuxotegida.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/54269464645.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608406690e815---mijikibanufonefil.pdfIn PDF document text
    • http://george-dollie-nelson-mass-reunion.com/clients/3/33/33de80a6744892f7217a81a137582dad/File/pewotarol.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/aeff1283c2316320b09dd4e5e87db3eb/vipenojewuganunawof.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/64tb23fjs7ohjbpe272dlkc1u2/lewiwu.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/23100071085.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/6d25865cd428683034fe4bd7b206b9bb/kivamigabevijitug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=courage+the+cowardly+dog+cat+and+bunnyPDF 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_off0000e91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91E 10860 bytes
SHA-256: 549b355972c34d4899fef373acc26e48ac0a3cc3c7fc95ea3402df9eb75d242e
font_01_sfnt_off00010215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A27 18236 bytes
SHA-256: 6919d8ec4ff327aafc8b3d6f792c6d16030f7243b4c4afc6f809d84e1e6eb9a2