Malicious PDF — malware analysis report

Static analysis result for SHA-256 133e003b6631f0c1…

MALICIOUS

PDF

119.8 KB Created: 2021-09-04 14:12:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 75bde1a5dcad67666c2853a2561f1211 SHA-1: 3b651204a0ac8a69b1bd1141f6b037e153828cf0 SHA-256: 133e003b6631f0c1743696bd486426616c72a4fbc252e242b10116f58168ab9a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL findings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=pit+boss+1100+user+manual PDF link annotation
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/667a07afb748a01dd98e39057d4510ab/41374201523.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3b4ea2df3---13149360827.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/99689451398.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/xasija.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/ur9he7fkkskq9ads5r004fc8j0/dineboribit.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073c9868fc0a---72163959759.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/xosuwi.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3b1e2ee8c1990997a5cdac52713d56a5/jejunim.pdfIn PDF document text
    • http://areaarchitetti.com/userfiles/files/6027354744.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7292c0a3e3---folakawagofekorij.pdfIn PDF document text
    • http://lblussana.it/images/file/nurimaresisojuxiremumesu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d2819aac3de---muvuzigudow.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160f3f34a63a82---zemukorefugabipuvime.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/89953441896.pdfIn PDF document text
    • https://coluer.ir/documents/file/tigixu.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210724_814F3D51C0654C47.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ed3bde048ca---panivuwe.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160785b119aa70---wexavidabo.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f7fc6c309---68876494983.pdfIn PDF document text
    • http://roanfamily.net/clients/0/01/01b24a6c100194bbc8678883f3cd4a53/File/64312417996.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/26560805802.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210828191208.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000168f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168F8 10684 bytes
SHA-256: 8baa88a2d2b2d2238c0e52ed9bf3ab21194a8b28c462a53d2636ced91124df71
font_01_sfnt_off0001817b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1817B 20744 bytes
SHA-256: 38b204f022516331b8a318408e93c1db14be85802ac6bdf3abdb16324f62b48f
font_02_sfnt_off0001b833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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