Malicious PDF — malware analysis report

Static analysis result for SHA-256 393e15bb82a5cac7…

MALICIOUS

PDF

93.2 KB Created: 2021-09-08 02:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32cb7619218e71595edeeefefff78a11 SHA-1: 61d93b2ed56fd9f5a75abeb5c2d78e7c17eb4eb4 SHA-256: 393e15bb82a5cac70a3e463348d0294bc0f456931a471575ac79cb75e4e4b1a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to obscure the final destination. The presence of embedded URLs and the nature of the heuristics suggest this document is part of a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160828f58d6231---bijulozerajirikaxobu.pdf In PDF document text
    • https://bodegoncriollo.com/userfiles/file/66546661466.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/58227026835.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/f769d9501aa5696c12a4cf0feee50653/litijamezoj.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316ad163782---37019517061.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/putuzeg.pdfIn PDF document text
    • http://kondicionery-elektrostal.ru/upload_picture/file/xorijutevo.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/62971894126.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/a1a7262b0cf82f8b11eba99bbff7b65e/tovujijobadoniruve.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c49ca12a9---dafarajezipiv.pdfIn PDF document text
    • http://olversonfamilyreunion.org/clients/5/51/51a48c89da211807e19ed56f8a1a1822/File/figajatememuwisanuxa.pdfIn PDF document text
    • https://datajournonepal.org/files/tijupozegopefakeno.pdfIn PDF document text
    • http://cke.hk/userfiles/kamome.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888c05e4a16---fopej.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/42434943636.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/61839514632.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/04d2bbf0fcd8964f95c678eeeda553d8/59189283178.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/72989490565.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a67a8c6257c---risujilibetam.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/56a809bd15f1d4703134d9c9dc566005/9521731582.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/85fg18ao30hcqhq33qah3preg9/57444065619.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manuale+d%27uso+suunto+spartan+trainer+wrist+hrPDF 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_off00010381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10381 10704 bytes
SHA-256: dd93bfa1ab97e5fa0d32e8fd022c8834c834001587d9debdad3c9d699906b602
font_01_sfnt_off00011c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 19320 bytes
SHA-256: d93321aa9b79d5ba6fc5355b9ec5ba718a5b1162026ed14d35e6aca2a0799275
font_02_sfnt_off00014db3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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