Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b33bf3082f46f90…

MALICIOUS

PDF

89.6 KB Created: 2021-06-29 11:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c305da8a8c3712b7b516091f1a157509 SHA-1: 8f8e9dfe4bfb4e4172f1ef52794f53be839d82b1 SHA-256: 5b33bf3082f46f90e5599e0719284a46bba91fb9e4f5ad7f5995f4f698782884
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd9d588f2f---daxafilolupezabeju.pdf
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cae84208cb2---27483244626.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a45a277bcf6d5cfdea00f2bc7f25c761/37016619888.pdf
    • http://atenngo.com/admin/sites/site/documents/tapolikebu.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758c0a34aec---sidulubawijux.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03011d6a03---wizolisereno.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/3661f5fa682b294719dd11bc76ee67c9/16686021422.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607609922a550---23993722321.pdf
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/fajoxipiki.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774b121c7ab---jixaxeki.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a5220bc5---pupisunakikajodakurel.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082989969eac---fabexalizafijezujazir.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/7e2c7c3d61237f2b3cbdd2e261bdfa33/manisivumoxu.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/lepizakobetebej.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a8cd9c60598269f2b3daae14b2f48b2a/sizaminolukovugaze.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5s1f8gtj6l2neek9cr9875scvm/zufitikijizo.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6f8462ced690f9dc10a41490274b2a17/45094197336.pdf
    • http://geobigoni.it/userfiles/files/90647781137.pdf
    • http://candybeauty.vn/upload/files/wulavabesapeninujebos.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qpj80v6b7qghqsvs2bktjp2r4h/44074117691.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/2e6009d28431dd23897abd148054c0aa/99372070065.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721ed5dfd0---kejimepemalepi.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e308ae13f4---nividumubozese.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce23865d55---52716299356.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=george+boole+facts
    • 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_off0000f9be.bin
63ecf7ba240a324fef348124b7587527f4ceec7585835a4f68836bb3834268d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10496 bytes
font_01_sfnt_off000111d4.bin
01506e6a78473e49fec8430ac65ab7dd1d18f3968da223f530437512a567d519		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D4 18684 bytes
font_02_sfnt_off0001412f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1412F 16792 bytes

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