Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c1b36079d77e0e…

MALICIOUS

PDF

97.7 KB Created: 2021-06-27 10:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebca224cc449a30a374de7471927b8b2 SHA-1: 26277d5ea94b8f34ad36b2cab591fdc3a92c33bf SHA-256: f6c1b36079d77e0ebcade3ca8abbe6a38bbcc4ead4afe90457a60f08547c64b2
156 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous URLs, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9898

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=how+you+doing+reply+in+english
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4031799276---50610455934.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aae432341---96326851607.pdf
    • https://scavilecis.it/userfiles/file/sifulok.pdf
    • http://nhsclassof77.com/clients/c/ca/caa0b9827732345dad94809623212052/File/bobewiboduri.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/5d536b7647e3b37e50cf13602502554f/wedadixebajobajirafijuwa.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/ek6lkm9emu9467kv7e1bdqh03s/76664568859.pdf
    • https://777mto.com/contents//files/zawonipovaxa.pdf
    • http://aliceinformaticasrl.com/user/pages/xupazokonineguwawu.pdf
    • http://lycee-elm.org/userfiles/file/feluxosuwogekupegixi.pdf
    • https://aneri12.eu/res/file/kowimozunu.pdf
    • http://cnex.cc/images/blog//file/davesaro.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/ao9dmtf54nut3q171ge4sh817n/40560894893.pdf
    • http://cokhixnktientien.com/Images_upload/files/25678966122.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160761e7003851---34242014601.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d20c297ca8---zorepekiruledexelu.pdf
    • http://werkkledingverkoop.nl/images/docman/files/70776397363.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/74dno1hries6lo5do5mvnv6n5v/61847055002.pdf
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/13rcru9llddjsmj7j3l6jcc4ti/tuvagewiroxibetugotumu.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/hpc7rjbaceb6m4of9eb0glhe63/jibatugeropezipopitonilup.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd7b1419fd2---32160689823.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/g3os69dvalr2ira4kro2rf5565/31659281833.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160820dfa90539---30625082684.pdf
    • https://soudurelausiere.ca/upload/editor/file/5030737512.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010219.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10219 16792 bytes
font_01_sfnt_off00011a2b.bin
a49adf6c3aa33eaed94334b23025ce00f6837f0e2584774637baf703564e75c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2B 18904 bytes
font_02_sfnt_off000149d0.bin
d0e02ea597b059e12c640018e4c0b859d2fbe31b167f59dc9fd0dc6423c65742		 pdf-font-stream PDF embedded font (sfnt) at offset 0x149D0 16488 bytes
font_03_sfnt_off000160bd.bin
5950c09271e96a86235fa125fe2be571b183917e899a5ce12d0b7e98cf79bdc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x160BD 10700 bytes

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