Malicious PDF — malware analysis report

Static analysis result for SHA-256 8507afb84a49b31d…

MALICIOUS

PDF

90.0 KB Created: 2021-07-04 00:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 02a71e2ae758ade8303277dea3635248 SHA-1: 68e59785cd4a9470956d9852d7dbf4fdbb29960c SHA-256: 8507afb84a49b31d7f8cc8ff6e7666659c10918a5a76c29b940fd374a58b8158
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content or phishing sites. The presence of multiple distinct hosts and UTM parameters further supports this phishing-like behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://swagath.co/new/ckfinder/userfiles/files/28593996929.pdf In PDF document text
    • http://golden-candies.ru/webroot/files/files/69763393522.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/3eukpi3b4m5m7k972ob4lterkl/22899996204.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4350eb0be---59578048786.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d49f83c24c0---94568573531.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608389af6d2f9---22970905295.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0784d026---fabozezexawarotosogowipo.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a3401f45fd1---nabukezujufexapi.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/vimujupevetuvik.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a538dd41841---dedolilaxefamotisuti.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/raxevubakirinibobipelu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/femevojogexas.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/bb4014df249ba1c41618193810d41fd1/12874168258.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8b8511248---sowokeba.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/medowigikilitiwoxomexi.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb5094d7c---feginevujapamogul.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b184f25cce---24402734506.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ebe27f0b---8965127726.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/ea41599757a6d5cb5254bbd19c41d369/13068731729.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ccddc57b8---keroromuzeposijosejogel.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/kemop6b720fta80uc8n2h4hk11/labovagomap.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/temisujajanipogep.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/98650132468.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3af9b3d115---taguvopa.pdfIn PDF document text
    • https://tavio.ru/files/file/36456698386.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/lobov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=pdf+iphone+viewerPDF 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_off0000edda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDA 30340 bytes
SHA-256: 63d7d13859a169eba086330b719c2422a2e9ad2fb74fa003b64d87461a285ef3
font_01_sfnt_off00012ba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA6 10276 bytes
SHA-256: e1b689d2a38b500044a2685057b0b24bac17847cc155514ce8d93086339dcacb
font_02_sfnt_off000142ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1