Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8887584db68ed05…

MALICIOUS

PDF

86.2 KB Created: 2021-07-07 23:33:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c8aa114bfebbf6feb6115ec59fcd67fa SHA-1: 991c8223223fe1a396ad214331e9982986c41206 SHA-256: d8887584db68ed0587bcfc9e21762ec8fd07c2a371f07a04c0a4c70356297e7d
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0fa5156e---5140761278.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/bbfe9e1046561f7461134784ba5f13ab/82475881824.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/59b442e8260d36cd825a869700f0305d/29649587092.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079eee2225e9---95953496991.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/60908329064.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/gqqvmbb77qq7h22qsvr3u8l217/41502029829.pdf
    • http://strategie-online.net/catalogue_dynamique/file/junavagadidabenulizejovo.pdf
    • https://ckd-otto.com/contents//files/55870755577.pdf
    • https://immo-cjeanpaul.lu/userfiles/files/297814051.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/8019993eed960a8b4f7fa59225f0464f/laxufam.pdf
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/cungnbcj432lgh9l42k9bbiv7h/28832770531.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/1d75vnaujiobh7oo1u9crm9ig0/vorefu.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/0cc80598ca8ec8faeb365a63f68ae9da/32018069365.pdf
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/32938798227.pdf
    • https://total-sport.pl/img/upload/files/34769460272.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/f8a8ec86fb34d666a0e6e734aa9f0c86/miboxiguguf.pdf
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/wofudaxanovus.pdf
    • https://sport-jicin.cz/dokumenty/88080827116.pdf
    • http://duda-tech.pl/dudatech/upload/file/40551518119.pdf
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/28a139f7c8d2835eeb263f84da5070b7/60225404520.pdf
    • http://randalljroutson.com/clients/44711/File/73438453482.pdf
    • http://skrabl.pl/www/rpbd/fck/file/16037332673.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/41e7b360058b43f2169445005b57d47f/98734229678.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+change+pdf+format+to+jpeg
    • 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_off0000ee5c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 16792 bytes
font_01_sfnt_off00010673.bin
c28cd28ce6dcf81f7eccf6b1c4aace7398653698a09ce3dfad96279a651be404
pdf-font-stream PDF embedded font (sfnt) at offset 0x10673 10968 bytes
font_02_sfnt_off00011f93.bin
2af3fe001eea9c8391363bb28dfb4c4bbfac0ecd455dca76fc3229a3d9cf5bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F93 16800 bytes