Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5fceebd3f577fd…

MALICIOUS

PDF

126.7 KB Created: 2021-07-18 02:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 34bb5fb30b77f55a2a2242c9bace2548 SHA-1: 6ef21c6cf64f43d48c22766172f011fa67de44ac SHA-256: ad5fceebd3f577fd717bcb70453ea0de96bfccce4dfcdcfba59aaf208d4ad951
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URI heuristics and link farm indicators supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xo-sound.ru/userfiles/file/zusifuwaruxadevumotud.pdf
    • https://people11people.gr/uploads/File/50624399649.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/60d6b15137e3e4a44b3aebd70e2815ec/89413580538.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ae56459ea---duzizi.pdf
    • https://aduanaldelvalle.com/userfiles/file/16491631982.pdf
    • http://www.gabrielamaciel.net/images/content/file/11224863310.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/dd7a2f80e8b59b23e1ba3167b8cbb2b8/vumamupupedugilos.pdf
    • http://midel.me/userfiles/file/67136970504.pdf
    • http://otevrel.eu/ckfinder/userfiles/files/64674499929.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16080948eb4c58---senosem.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/1cn4vi0245j7f36e58rns3nc96/23345472906.pdf
    • https://basisnomor.com/contents//files/pivozevugesa.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607b65e1d2fb3---wejokogo.pdf
    • http://agcslohian.com/userfiles/file/nowekasijadufiba.pdf
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3v3n7so1g213p6o4scbhevk7vn/45859419297.pdf
    • http://teranor.com/ckfinder/userfiles/files/81640157905.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa38b49243---66046761583.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d5d7c2f90---59575076526.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/32d83b0dc091eb6c5e9a535eacbb298a/xisemagiviwodi.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608072ad86188---mimaguxi.pdf
    • http://xnucleus.com/members//member_images/files/12353700869.pdf
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/gi64arjq7ug3g338nps6eqhf87/57064671446.pdf
    • https://deltagroup.bg/uploads/file/feguma.pdf
    • https://digireg.pl/upload/48410996910.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=the+courage+to+be+pdf
    • 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_off00018ab9.bin
99f54154f15daa71fd198b65f861614e0d3629ed92819c0033f528bb22563d93
pdf-font-stream PDF embedded font (sfnt) at offset 0x18AB9 10692 bytes
font_01_sfnt_off0001a2f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2F4 16792 bytes
font_02_sfnt_off0001bb06.bin
3888f8fbbae2d64893e499329e189d426053be080ff0801c29880a7fc72d7e26
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB06 19784 bytes