Malicious PDF — malware analysis report

Static analysis result for SHA-256 c249b2f3639c9fe7…

MALICIOUS

PDF

87.8 KB Created: 2021-06-28 20:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8cb182c5fc59a320de46364a482fe4ac SHA-1: cb56ad1e13e0c8b6e91d84b942a4b12ec1b0dbad SHA-256: c249b2f3639c9fe7ce539563d5d089123a4e2d8f634c6737469c6763a37ca8e0
164 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised WordPress sites and other domains, suggesting an attempt to host malicious content or redirect users to phishing pages. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=head+of+client+services+jobs
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93126537e---78978561377.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44795b3533---latefedupixoboxolavetona.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebd5764370---nivipin.pdf
    • https://mayurherbal.com/userfiles/file/sirixakidanu.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/029d1318f2442588bf44179a85f4d0e0/kaxafikonutex.pdf
    • http://angerdress.store/ckfinder/userfiles/files/bolujizobaxudikajol.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e80668da---71940564655.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63da42b9f7---96775755300.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc057720f5a---liwoboxaguvokenijinirufi.pdf
    • https://daaeportrett.no/upload/file/43489049285.pdf
    • http://aihyang.com/userfiles/file/lawukesupilidifisufuzid.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/c961162993d61cc195b198a416250c21/65668101381.pdf
    • http://polish-house.com/uploades/fckeditorfile/36179251535.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/qp5s7kei96leib1sl3fsims1d7/27153751457.pdf
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d81f4e2f0f5---juzisogupan.pdf
    • http://lighthouseofworship.com/clients/44803/File/33777883627.pdf
    • http://kasargod.net/uploads/file/76116485534.pdf
    • http://sns.hu/_user/file/ropoxusowazesabubinovibop.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095f99d2aee4---36159149789.pdf
    • https://btegypt.comfile/vafemifevif.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/d9532b6ee9eb9c2c1c94ce6037e9fa02/25861504463.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/onodqla6btbgoo877edoftp049/nizogipedezovusobo.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/nodgjvan1a5lhq7oaifd62tem1/47753703001.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d955e66645e---labegujipisapav.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/6ci09fibf2klak9vm2ak0j3j8i/xaviratogaletulubirot.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_off0000f2b0.bin
d7bd29ac7b101f4bf14251e0486dc79dd615491c737107f5ae4ddec180e3ef35
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B0 10796 bytes
font_01_sfnt_off00010b95.bin
404f17939237cda89cd45f49c282dcb5c82e6e0e8439b3d18226b16010cfd51d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B95 17696 bytes
font_02_sfnt_off00013a0b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0B 16792 bytes