Malicious PDF — malware analysis report

Static analysis result for SHA-256 193b2db28792c9a2…

MALICIOUS

PDF

92.6 KB Created: 2021-08-23 13:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d5162942a5d838a317c516a636cfd68e SHA-1: 16b568ac05e88f1e8c29ea0a7760539c4f6b5a3a SHA-256: 193b2db28792c9a25432791adaf8f09d34f724205b75973fdcc201c3ac9b286f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure indicate an attempt to lead users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://parvazyab.net/basefile/api203/files/dejili.pdf
    • https://alajuusa.ee/media/contents/file/86564330513.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b308c77c72e15c0ea4abec4a285d5f23/81994009479.pdf
    • http://uelzecht.lu/userfiles/files/zewiduvidojiletuvesikawu.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/zinusakakilakowo.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/c6796fb761ffdfa85bd85dd52f238669/94206161636.pdf
    • http://hotelpenza58.ru/ckfinder/userfiles/files/93174981865.pdf
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/3bf5c662a033750bec7596aa838999ed/guzuterubaxek.pdf
    • https://rybczewice.pl/userfiles/file/salixa.pdf
    • http://gibisch.org/files/files/polejamufuxamumilex.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fdb4bbeb9---lerijeruwebivatanutiz.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/c4cuaton5ibqvvi3luobt54av8/vifirixijiro.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f455a1e019---rumemurowu.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/leef4fhg6kjb1hssfbsmhc25ed/82920090538.pdf
    • https://nangluongvada.com/uploads/files/lutup.pdf
    • https://kamedia.vn/data/file/xanuvufijuf.pdf
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816c8f8f7d4---68166833303.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609dba861e613---vibixodarafekiniti.pdf
    • http://orgue-chantepie.info/FCKeditor/upload/file/nadeboxaxigobuzejalu.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/dfe389193eef943218d4d1348995efaa/xidenuvubenakifam.pdf
    • http://abwingsva.com/uploads/files/buvawobitifalereludom.pdf
    • https://aykutemlak.com/upload/ckfinder/files/zosodanododerajonik.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1d893811c2---22255744884.pdf
    • https://thegioidongphuc.net/ckfinder/userfiles/files/juketuveparukutu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=where+can+i+watch+midsommar+movie
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000104fd.bin
a9fc0fc53f28fe3e853d12311f9d062a169f41d4f78b589f839a4fd3100084a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x104FD 16932 bytes
font_01_sfnt_off000130f3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 16792 bytes
font_02_sfnt_off0001490a.bin
4682ca2e56f68e39ffb1ead3f9920c274f2abc8785d5d89047b894dfaf65a078
pdf-font-stream PDF embedded font (sfnt) at offset 0x1490A 10732 bytes