Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc29fcc99b19e840…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 18:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f1d12ae6e173556a4a43e667697a084f SHA-1: a5bda2c03df435c7a92005315ddab3622237f9ec SHA-256: dc29fcc99b19e8405e730573c2a0baca18c7e682e1735ad44c916f59083778d3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and disposable hosting domains, indicative of a link farm used for phishing or malware delivery. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 https://pistant.ru/uplcv?utm_term=health+is+wealth+example PDF link annotation
    • http://scea.edu.mn/ckfinder/userfiles/files/dabomejadog.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140d691ba15f---82214635886.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/40471149929.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/91456040328.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614d75eb84d92---roguvapezu.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/96342687932.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/vejajudutulolakes.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/kotobegugiluxufizokamaxe.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/9026708170.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/belababuri.pdfIn PDF document text
    • http://gartenbaukoeln.de/uploads/files/11079074278.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/50755738964.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/26946365287.pdfIn PDF document text
    • https://onlinendttraining.net/files/85504319764.pdfIn PDF document text
    • http://ashokarefrigeration.com/userfiles/file/kosolujiduxenibudigaj.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/11623711020.pdfIn PDF document text
    • http://bagliodeimille.it/userfiles/files/90306494260.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/88173538777.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/ragidujojolaveravubanuli.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109282320231982.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8b3c54376---36074517780.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/javebonoga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09C 16380 bytes
SHA-256: cf933b388ed363be65627c6f17817c1bc32e56bdbcf816c9bc7f6aaa1da28eac
font_01_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 10372 bytes
SHA-256: 840f4f1d7dc368b3fc0907fedee9ca231ae501802f5d79ddd89c940be5a8ea34
font_02_sfnt_off0000f168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1