Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f87492b88ea9d8f…

MALICIOUS

PDF

106.1 KB Created: 2021-07-07 08:28:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3e26334f4557466a7667d88d67888a07 SHA-1: 8f66b9be4987f4cf6afbd5d322bb7a41fd6759c0 SHA-256: 9f87492b88ea9d8f67c12aa780f0401dec110e3b4e60196351cfb1ad5d506789
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a602f0f25fd---ritazozupobobo.pdf
    • http://a-aqua.fr/ressource/site-image/files/12250535212.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba028e500b---26117360447.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ddbd0a1205---gebuvurig.pdf
    • http://akinmedikal.com/uploads/file/1214196089.pdf
    • http://emmanuelmissionarybaptist.com/clients/74938/File/sinabemovevodotezafer.pdf
    • http://emailreceptionist.net/userfiles/file/vipek.pdf
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/gbqr7ho4s2s7evpi12u7udbmb9/kujegofu.pdf
    • http://temple.mo/userfiles/file/18210212333.pdf
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/zazudenupanufiwuwul.pdf
    • http://kurdumovldpr.ru/uploads/files/9530500229.pdf
    • http://scro.ru/pic/file/gisofeturagirefebozesuma.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608691e855404---fopuditirizebinizuj.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609082fd7c4cc---47348289003.pdf
    • http://greenplanetnepal.com/userfiles/file/84654059528.pdf
    • http://medica-brno.com/files/talifotadowube.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/803f74bfed5bb2f2c8b3e65d91ce8ba3/79560779437.pdf
    • http://cuakeobinhduong.com/upload/files/bibozuvusikogudubolo.pdf
    • http://www.aadhar-interior.com/userfiles/file/wijuvoziwes.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/a711d07a91847af045ce33bf9a90e97f/22966806889.pdf
    • https://prosperitas.be/data/assets/file/97740154108.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788ca7f01e6---45156893428.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=introductory+econometrics+a+modern+approach+6th+edition+solutions
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da3d.bin
6edf3820c717eb46ef0a18d56d4b3a343a90397020c0ae4dc14aeba62a168e96
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 17096 bytes
font_01_sfnt_off00010728.bin
c65d2e5afa8f03523f65dfe48d3a0634cd23b42cc2ebebe4a40d3aebef1bb7d1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10728 11112 bytes
font_02_sfnt_off000120ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 16792 bytes
font_03_sfnt_off000138f8.bin
deda48f39ef138e82155291cdfa06446829809f927790e46e0064ed82a440e3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x138F8 35876 bytes