Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e5f91ecb4cbb35…

MALICIOUS

PDF

62.3 KB Created: 2021-08-11 17:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7a01e1c4e98478608dd6c30c70240d61 SHA-1: b4639a9d8573f219925450808a4f02a0f7795db9 SHA-256: 23e5f91ecb4cbb35bde8d54ca79b9c6e8ef733b1aefc7ccc91533efdfcc0d9cb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and link farm heuristics strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8633

Heuristics 5

  • 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
  • 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://cructi.ru/uplcv?utm_term=talking+tom+angela+hack+mod+apk PDF link annotation
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b50dabcc5320434bce0caf064975f405/2004366400.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/4592243323.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/kotenuwisobenajabewi.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/3d9f37df250d862f037ca982b602b237/nunujevomim.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160e1156b830c0---faxogewevevezilowonupove.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/6fd8f58eb79fff10f4478b5a7d0770d7/14430898413.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/nezirejikabiruvababexa.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/bamigirodotuforagurepe.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/163gs3rdo9kn4qbtgvetrmflpe/wakubijuwuwozutagak.pdfIn PDF document text
    • http://globalquestconsulting.com/userfiles/files/korezoxajur.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf308d87c12---netunezesofowivudebediwun.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160803dfc55a3f---75545917859.pdfIn PDF document text
    • http://isgsrl.it/images/file/23165864407.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/7b27c5a154b4ff3260549c0d081e056f/27532269077.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/50752955162.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/311aaee9c53f70d80609dd813c3f6bf0/gimopenewopep.pdfIn PDF document text
    • http://jungvassar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29686602942.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/kalufidas.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/mejebibezirusimokajam.pdfIn PDF document text
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/hihhs1gsuaev475t70s3sh0di6/jozuk.pdfIn PDF document text
    • http://sumnerclassof1976.com/clients/4/49/49b54eafcc86ae0c30eb104ab8b91c7c/File/51471267664.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ccc42894a4a---ziduxosaruful.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/puluzoxize.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/lokusam.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076ce05e6632---78082641258.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/29b0da25bec89a4b34893521785aea96/nuriratutowopegarow.pdfIn PDF document text

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