Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab208e5cd1924a60…

MALICIOUS

PDF

70.4 KB Created: 2021-10-01 13:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a54b191b797df86c080912d91d3c6899 SHA-1: cf72889f8a5520f27c42fdd5de9868b2127d1b6c SHA-256: ab208e5cd1924a60d4de879873d7c3ff7525989997a941abc7afeb13d4c77a6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, forming a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://mastera-mix.ru/ckfinder/userfiles/files/sobokalomivizek.pdf In PDF document text
    • http://sochi-polyana.com/ckfinder/userfiles/files/lebusukejeremuzoze.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/7230216727.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/3366594442.pdfIn PDF document text
    • http://186086.com/upload/files/wozuwuxoradabevidenate.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/14426377124.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/nigafe.pdfIn PDF document text
    • https://contemporaryteas.in/admin/uploads/file/32192729094.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/legigikiguse.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/sikaforukifefefusopofe.pdfIn PDF document text
    • https://mayersoffice.com/userfiles/file/5937728774.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/46204337413.pdfIn PDF document text
    • http://na3.it/misc/file/98592392213.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148585d44e80---38837927369.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/fotejojojunuxarar.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/54343537305.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/364fe225480eabc9d6af28d1ea05294a/pugaxop.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/mosidos.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/51884215664.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/zotutidapu.pdfIn PDF document text
    • http://bionazorat.uznature.uz/userfiles/file/36192109525.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/tegekiz.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/memaloriwavusesofikixeg.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161379f5b60c56---4886429358.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/gopetanosefopiban.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/39207058949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=porn+vr+apkPDF 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_off0000b24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB24D 9868 bytes
SHA-256: 5affcb3e272048bb4a897a50f6657e819807654bf7154f10c2f1317b6ed3fc16
font_01_sfnt_off0000c81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE031 16840 bytes
SHA-256: 31c90b7b75d5dbbd9549b15f07209cef26f589a0a5d0ea086c85a06cfd2f56bc