Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f2bfdaa733dc4fa…

MALICIOUS

PDF

76.3 KB Created: 2021-09-09 06:50:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ac4fd3eadb0ae300c95095b5a2a0888d SHA-1: 7bd5714f09097f449d6f179533b42c646c6aa1a6 SHA-256: 0f2bfdaa733dc4fae92ba233ce6a79afd99200328ee8751455ad0e8cf45afc07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://rosg.net/sa_upload/userfiles/file/20210903070808.pdf In PDF document text
    • http://benetalent.com/upload/files/fukafof.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/8845020783.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/48f2037d70e84410b4061105bc14e1b1/54018701395.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/fukotoxofufovavob.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/vegur.pdfIn PDF document text
    • http://dothi.info/images/files/94899551793.pdfIn PDF document text
    • http://vucert.vn/uploads/files/tazigoxubaxategurufes.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/21675821762.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/tewogekimoxani.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/fofusozaja.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161378f14ae0a6---37759990372.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/66854076563.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135862a2bf52---kodenuxevefubokoge.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/uvqnqnrdrtpusp0d0bkqk8e1ue/85432302188.pdfIn PDF document text
    • https://foodsafebox.com/ckfinder/userfiles/files/wivolejafomebu.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/zemedufarileredojaxelu.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/xonaguzexilidiwig.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/zefigitexejolokoligede.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/37989142978.pdfIn PDF document text
    • http://anninh247.info/upload/files/90797928313.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161363c37b67c2---wiwonoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=global+directory+apk+downloadPDF 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_off0000c598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC598 10812 bytes
SHA-256: 2bf216b00acff9b942e65ab43b11a8d534f81aa35d5c31ae9dcd08fd9115edff
font_01_sfnt_off0000de7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 17440 bytes
SHA-256: 2acf67ec5eb1f4d62c474e7293bdb5a59a3cad05f87dc10e96fb90e6842a02d4

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