Malicious PDF — malware analysis report

Static analysis result for SHA-256 31262d822df5a12f…

MALICIOUS

PDF

97.5 KB Created: 2021-07-01 12:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc6d530604bded26f645074619185c9d SHA-1: 449a737368de034ade7fc482b35a257a8dbbd5c3 SHA-256: 31262d822df5a12f9af3c9b4987b2348bf2b07acb5511e3fe46edb66f0a61244
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites hosted on potentially compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://belhavenhighschoolalumni.com/clients/13962/File/23617678327.pdf
    • https://umutisi.com/umut/upload/files/21479872790.pdf
    • http://teckim.it/themes/userfiles//files/zewajit.pdf
    • http://vasvaripalmuzeum.hu/upload/file/74366682476.pdf
    • https://magnettoptan.com/upload/ckfinder/files/59104919596.pdf
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/674fch29s83u8t6ghac8f22r56/wujesiti.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160804e8384f11---simoxopevakasezafoxogek.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/07a499693d9bab804edc70f2ec4c48fd/melawusidopiwunix.pdf
    • http://collectifff.be/imgdb/accueil/files/famagusoz.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735c7024632---26776983594.pdf
    • http://braciszewska-klimek.pl/fck_files/file/bumavaniraborafora.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/desatmg51t0d9pfq7q74eg4e07/614865250.pdf
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/xiwajubujipuzupemudeke.pdf
    • http://4seasonstours.in/userfiles/file/3982140701.pdf
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/8r2aq0hd6j929u4ph9o4kc0utt/kowejofimivovupivifal.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2efacccda746a1203d1ac1e786cd6818/nuzimigudazurenerilobu.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a78fd996e92---28547663938.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfeb5c400b---31462480779.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609529bdb575d---52644417181.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16080251044a87---77702789836.pdf
    • http://worldofpacifiers.com/editor_uploads/system/files/telumor.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/tag5qumcogr9f6u0tk1akiklr0/2493805440.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/leee5edqrl3itsgnsjr6tqjei6/70119604139.pdf
    • http://luvnchrlysenglishtoys.com/clients/861429/File/54221666241.pdf
    • http://coming-c.com/userfiles/file/70448569046.pdf
    • https://lifo-sea.com/ckfinder/userfiles/files/9083538155.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/838d33495c11bef121dac3e910bcc1ae/39247033730.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=has+been+or+had+been
    • 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_off00011923.bin
6d59a020fedaf7439b67768a70285e8fed38e2abbd4179ea3a679193d9c972a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11923 10240 bytes
font_01_sfnt_off00013003.bin
44daf9ea2b046b166194702d37f6fd9f72f060c7e843a08361da0972e1a36c4b
pdf-font-stream PDF embedded font (sfnt) at offset 0x13003 18556 bytes
font_02_sfnt_off00015f5e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15F5E 16792 bytes