Malicious PDF — malware analysis report

Static analysis result for SHA-256 6095625207eb8744…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 19:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 05e88fb421aa6b7b1693cafcd3b77b1e SHA-1: 49ba6cabc2890d1aef20c4247d73a7e6cc9b4272 SHA-256: 6095625207eb874468c5c1e1ca10db7b2340407ef6d0cc6be34448933ce470ef
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to external sites, including those hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware through these links. The document body is heavily obfuscated and does not provide direct textual clues, but the heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7403

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 http://master-vin.ru/files/file/18970985209.pdf In PDF document text
    • http://elsped.hu/files/file/fetubojogofubanigep.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/76274952579.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210920_021946.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/49346726283.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/10924486472.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/2021971156206001.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/zovedu.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/e77256c0ca4e32d85d0c3525a23df3cb/26269901451.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/82366130129.pdfIn PDF document text
    • http://nwatchonline.com/userfiles/file/makoxowowiwepezo.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/zemidewubagowoxi.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/64331190798.pdfIn PDF document text
    • https://profm.hu/files/file/84873676285.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/80222667730.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/nibusi.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jezonoj.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/74727204092.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/91118667534.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/daxidokanajinemuvirejida.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407572ac0ed---mebawegimo.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161427f3056aba---dukigodilup.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/motuwumobamokisejiwiwego.pdfIn PDF document text
    • http://phanmemerp.vn/attachment/files/lobebufobixanajutakota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=android+1+mgamerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA06 10312 bytes
SHA-256: 514b4c75570a67f1a1fbf4f3f04da5682850a9efc24cb073233a5156ab970576

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