Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83386e8ea40554b…

MALICIOUS

PDF

82.5 KB Created: 2021-08-23 16:36:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3ee79945d462e817c183a65a84d68866 SHA-1: a503f875cbc1909334b4977a1cb9870589d71ac2 SHA-256: b83386e8ea40554ba0c1b384fee81236badaab1e00099eccfd94bacaf11821c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://infrive.ru/uplcv?utm_term=new+3d+extrusion+from+selected+layer PDF link annotation
    • http://sea-cruise.ru/ckfinder/userfiles/files/vavapepigobilapus.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/06cjp2hjc7hda9iv4vnqnp49c1/5893206103.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/7o96nkrrcjqplhvn4ubdo447gi/xazalinojam.pdfIn PDF document text
    • http://ruegen-ferienhaus-schneider.de/userfiles/file/96781030070.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/29034792770.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/31757339866.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/89209112480.pdfIn PDF document text
    • http://packturf.fr/files/kidisoruridise.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/pofizesozegixosaj.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/95647570951.pdfIn PDF document text
    • https://vientangluc.com/upload/files/pupetupekenoz.pdfIn PDF document text
    • http://domadoma.cz/userfiles/file/18320702969.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/ggpejf6t81na1q8ocdopa50vku/84722422406.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/kazadepebezizepuvufobupi.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210814184623.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160fac20548440---vegopo.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/tekadiraveb.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/8b72dc4b9af103d2806610e28e303447/41387707596.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/032e4da56ab261dc3284881ba4177f76/kuralogumebixanukike.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/rodupupinegisakivowopum.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/keveg.pdfIn PDF document text
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/ed8a29265aeca4481670c23d2b5659d3/2904021238.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16081fe39e2025---55698849938.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16120170e32541---17939421616.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_off0000db6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6A 11188 bytes
SHA-256: 3eedeeab5862d71fe3974d1753dfb843ac9103e73399d31e93099db9929f42a6
font_01_sfnt_off0000f5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010dd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD2 17044 bytes
SHA-256: cc668bf0fa6cca35c1555a211b91557c2fbe4ecad905d299c6ade17a0989b0ff

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