Malicious PDF — malware analysis report

Static analysis result for SHA-256 167ad74ec41ab298…

MALICIOUS

PDF

84.5 KB Created: 2021-06-25 15:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 72a17db887054599d9c2fae5d04442e2 SHA-1: 8c464b27cf6dd7acf1a942d9ed226dc05d485af2 SHA-256: 167ad74ec41ab298d604868ace182072bf919e89625b102ed56b0f3e5e2a0073
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish users or redirect them to malicious content. The primary function appears to be a link farm designed to distribute traffic across various potentially compromised or malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://drafthe.ru/uplcv?utm_term=sushi+the+global+catch
    • http://palaciodelosnavas.com/userfiles/file/lumunazawidutakixadajur.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e3b1ecf8b79e801e4b119739f6d1f41e/82282699674.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/qlb0ri0trgpnks18m4d9v3gllo/mokagosofosujoworazurup.pdf
    • https://olivierdaulte.com/ckfinder/userfiles/files/bajumukomikulab.pdf
    • http://volamtuyetthe.com/userfiles/file/71298742709.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/b5ca3be688ec5bc3ff849116540c9533/3555595829.pdf
    • https://aterhesseg.com/up_image/file/71808078166.pdf
    • http://stellamaris.cz/userfiles/dalinivedisidudifutul.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/a5667dc3113e6a15e9cf403834e57bf4/82881040504.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/60706157649fe939e28fc56f1f33c9cc/zafidilu.pdf
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608509c6d12d7---22814721934.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc0eb3b1fa---96674213912.pdf
    • https://catbasailing.com/upload/fck/file/kagozuxikupusekurawob.pdf
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b408d4e2---walewowuwodu.pdf
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160830ef22e735---96607731215.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a0eb9c33f6---94267916379.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fa.bin
9f10d289e83f97a2259e9eda6d731b523b7342a91b5207b06f6d6a2fe31c3a7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 19108 bytes
font_01_sfnt_off00011389.bin
3e130217f36b01c9e7289ff6718ad69c599202820269f13a2fb8614782a633e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11389 10620 bytes
font_02_sfnt_off00012bf4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF4 16792 bytes

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