Malicious PDF — malware analysis report

Static analysis result for SHA-256 fafcfbf45420c7b0…

MALICIOUS

PDF

94.7 KB Created: 2021-07-05 23:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8593b18ee62673e5f182228792e48156 SHA-1: f351c80782a138370292ea3af05f04231693b054 SHA-256: fafcfbf45420c7b009b0c1c3a417607660fbd3e43f011dcde29482e431173408
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of multiple compromised URLs is a significant indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa4386c44b---70257444194.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/192afef32218f95107f00da7c988969d/jebosebuza.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bedc4b5062f---jubalazutaduwolovo.pdf
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/e625fdf88807bcbc9092e7749ac79738/80576426633.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/3e9290e4b430b4649ce2b7636ba19fb8/19274374561.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a528cc41f---12137985936.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/3ac8e5e868e4e8ac6755c651e15fc9db/27812498305.pdf
    • http://zigzagontwerp.nl/sites/default/files/file/vutedufebusujokobikafa.pdf
    • http://elturo.ru/img/upload/files/kodumawalozuxukona.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/e1aa802f48d7eb5dea770a303d935e57/roburemixizajuweboreg.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b627a64be24---85150962411.pdf
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/fb3dfb4f69691687b2bb2e866c7f309e/80597879143.pdf
    • http://akinmedical.com/uploads/file/ziwudokijupi.pdf
    • http://optikametuje.cz/userfiles/file/55329640878.pdf
    • http://rurisnet.org/images/file/zowakuz.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/vobizupunoretafeninixe.pdf
    • http://www.aadhar-interior.com/userfiles/file/59948074301.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sofup596jlh38otkvh3o3cn6go/gevijabovu.pdf
    • http://stfrancisfrankford.com/clients/9/90/9051900d87e3fdd5bc97eff612ac54c4/File/lajabedoxot.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092c2945b472---57142619363.pdf
    • http://pospatrans.cz/UserFiles/File/35050434912.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d36d44d1d7---rujoge.pdf
    • http://senseoftourism.dk/userfiles/file/wupusaja.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=cpm+geometry+chapter+3+answers
    • 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_off00010a51.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A51 16792 bytes
font_01_sfnt_off00012263.bin
55e19ae9834a99d314cfa3a0ab17113ab71d6065337effce4a137eb0f1b5d612
pdf-font-stream PDF embedded font (sfnt) at offset 0x12263 18388 bytes
font_02_sfnt_off00015268.bin
39c97508831543a9050c947ce6c8a6dd4f30dc46b4edcc263f41b2ed0e40da7f
pdf-font-stream PDF embedded font (sfnt) at offset 0x15268 11088 bytes