Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64345a568916b8c…

MALICIOUS

PDF

40.9 KB Created: 2021-08-18 00:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: c9e66d0f9f7d0bf978616d5d676d36f5 SHA-1: 9716715ea36b3f14fcd6bd58698924e2d1fd1821 SHA-256: b64345a568916b8cf39180434ce230aa2ed8364ed7a69b3f658119544a9483c2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and uses an image-based lure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8284

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 40 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 http://patp1ryb.ru/media/file/52718040250.pdf In PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/73936695101.pdfIn PDF document text
    • https://premiersuli.hu/files/files/35177884934.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/2sc4o7sp98lue1o7filu9tlrio/649785855.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fivj45h6l8tqbfpjoialgpeie6/33685627641.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0bf643235432a25e52b376db897e11d/52362289757.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/et1r5j7l0qkdqkr3038raf9o92/lizowusefo.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210611_A01B7AF8209410D5.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/384b6255ed0a29bc548adb82f1be71a5/592407693.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feddaecc7e---mefuvijexifironawive.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f5ece4d7f---vuguzixilurepotaduraj.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/b5aa198184c23ebc3c5c76562d209776/jikitovuluzoven.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/ravurawebokuvaruvami.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents//files/74159734267.pdfIn PDF document text
    • https://pacpartner.net/images_client/imagesfile/1125787028.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/50459845160.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/1d8dfcb30a37f590fb9b9f1307f72ddc/xatugofigeduzoxazufa.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d499b129042---wafatazivuxesup.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/c431a3dce71798faefb2874f445a3d54/zekulabugefiri.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/73052607745.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=exerc%C3%ADcios+ora%C3%A7%C3%B5es+subordinadas+adverbiais+com+gabarito+9o+anoPDF link annotation

Related samples 8

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