Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4da86c80c852ff5…

MALICIOUS

PDF

106.8 KB Created: 2021-08-18 11:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 56f3ff155269fbaa35c5609c8dba8df0 SHA-1: bb3b28f8f2d215d824c4757b6e9ea5d1269df07d SHA-256: f4da86c80c852ff5b2fc3e60f0b831759996fa20a97f140e1fc13a8aaeed8acb
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous embedded URLs, many pointing to WordPress upload directories or disposable domains, strongly suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://gwhs79.com/clients/867100/File/lirum.pdf In PDF document text
    • http://terezmisszio.eu/files/file/35230684748.pdfIn PDF document text
    • https://chezgregoire.fr/userfiles/solazasivexopavomozamub.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c42f02c959---80344578556.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea007135ca---97999255507.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/544d32cd6c3da1baac02a4c48bbd4637/3174291088.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/radedojikule.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/44sgbccdqrac4kgj4nsc9ok3mt/xikofujarikedirik.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/raburanabefonuwag.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/34344366270.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f93f1483d47---nakezaxulanu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bd65b455b---95285236102.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/zumabofelogupesojuw.pdfIn PDF document text
    • http://arslanemlak.com/E/file/55040297360.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/wopomuwadavixe.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160afc89c20db8---39807178261.pdfIn PDF document text
    • http://laser-piskovani.cz/democms/userfiles/file/wifuvixemosesogobuz.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608601d3ca237---durixuv.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/36475522140.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079015acc13f---sumokajidegikobamivokabi.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/234294021.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/08889b3c5676984155749845f800000c/40048917222.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/0fe3f1ad5bd5e1745200305437d78e1b/70291461436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=mothercare+classic+travel+cot+assembly+instructionsPDF 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_off00013d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D21 17380 bytes
SHA-256: c56322b31f4e2e97bba0fa85d549f17f55854ca91566d72b7f0b8af888f80f45
font_01_sfnt_off00016ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AE8 10908 bytes
SHA-256: e38cdb324ef2fbe8e032fae487eb1bb71e7f89d2e071f09d3326397a4c3aad1b
font_02_sfnt_off0001840c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1840C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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