Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef1fd82022c21f0…

MALICIOUS

PDF

56.8 KB Created: 2021-09-09 11:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 33f4123830db0073c9702f1328bf96a2 SHA-1: 99b6374801c5cfb91eddff623e05d6b11f90a777 SHA-256: aef1fd82022c21f03514fcff4b684dfecdb0a3e9130e79ff5f6c236b93188c12
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as a phishing trojan by ClamAV. It contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised WordPress sites. These links likely serve as redirects to phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2891

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=open+source+android+app+development+software PDF link annotation
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/79d52cb8923ea2e9a570f31320ab81e5/73276891124.pdfIn PDF document text
    • http://xn----dtbsgbucafmmaf.xn--p1ai/servimages/editor/files/7185077638.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/dilaxubodegodana.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/tuzunanibuwizofefujesule.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/43326007571.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/rurarajefimosutit.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/woniwunanezajawemosiku.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/teluba.pdfIn PDF document text
    • https://mmeasar.com/mmeasarfiles/file/42417333141.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/69280117197.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613992e24c814---mezoxiteraxawapijoloniw.pdfIn PDF document text
    • http://webs123.com/userfiles/file/pepis.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/8740232555.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/murugitug.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132daec5030b---leberuzugazafebuzide.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/dosepubupativokiri.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/zudipaduvopalewak.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16131121c4bf26---javepamor.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/pudekiwagebojonujin.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nivuwitu.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210903064831.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/h25bcfskl8lvbsl2do2dttpel7/21531702850.pdfIn PDF document text
    • http://sksound.com/userfiles/file/23216258506.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109031558122702.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/15082168478.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/9044833412.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/vemenoboxomagozafufedo.pdfIn PDF document text

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