Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b4deb9fd7ff863…

MALICIOUS

PDF

64.3 KB Created: 2021-06-08 19:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 227da4d7711662793513121564df138d SHA-1: e706bdc10185a198cdcea7809256758f56ee5b1d SHA-256: 99b4deb9fd7ff8631b3ab97e04541ea003b432a547b5f9e2721b84f9d8d3687b
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. The document is image-only, typical of a screenshot lure, and contains numerous links pointing to compromised websites and disposable hosting. These links likely serve as a link farm to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9099

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 64 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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
  • 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://allytemp.ru/uplcv?utm_term=five+nights+at+freddy%2527s+2+unblocked+games
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/g8s8j6gikfg4l8uhvns77itd6t/67427323033.pdf
    • https://anpheatingandac.com/nbloom/fckuploads/file/88549014404.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f496723ae6---26836197527.pdf
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/617e291cea4fe525c7a89bb53ba31e54/luwapakonajakemobuf.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1aef966f4---34914008643.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160774fe166458---bogifaril.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/31574ae40b01f9bc095ee432e2e361da/kotikinupopazobikino.pdf
    • http://budoprojekt.eu/obrazy/file/92493854275.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160962cf8d8ad7---82998585774.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7c84f1bd9---67421638136.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ifmbv9b6j5ckuoautvqdocjgm6/25884111976.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcfb1d7eb0---vilakifebimis.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/d0b8h2iflhjb6ghhacbmoocnf3/goterinesiwivalisev.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607784ebae813---gumexu.pdf
    • http://afgventuregroup.com/cfiles/file/nufevamumulew.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c498273c42b816f42d12947c706889a4/felezawegawimikikode.pdf

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