Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e8a71124ff88217…

MALICIOUS

PDF

85.8 KB Created: 2021-07-16 21:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b11c7ad2e4fefcab8c97a3367b049fa5 SHA-1: 5405f7e705559973985ab043e6c659e1c2f21174 SHA-256: 0e8a71124ff882171fc59001fb54e503e964ccb65327c6ecfbcef6a3c931159b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple links to compromised CMS upload directories further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/c63fd97349a545ac1191a0a498b75059/61109384713.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082672e5dcb2---doxugozitazoliv.pdf
    • http://aodaiminhhanh.com/app/webroot/uploads/files/xososa.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2b2faade4---67707292932.pdf
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783bfddbc3e---modenademuzovimusesop.pdf
    • http://xz-brand.com/ckfinder/userfiles/files/selekobidadadilusajejamo.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899384d7c12---mamomurukirilowedavudi.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c561e09570---lopitim.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc94244f9a---49147403846.pdf
    • http://lesen-und-schenken.de/userfiles/files/gamapisigajigujepi.pdf
    • http://permianhighschool1970.com/clients/e/ef/efee9fcbc667252fc4b649c8163d3733/File/57017537907.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/7116cc9228f3709848d8f7d4e99edbc2/36978767391.pdf
    • https://susta.vn/userfiles/file/18953919982.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e8f0a1297---jipunilekadiditaker.pdf
    • http://dakmet.pl/upload/wagalo.pdf
    • http://maekalocal.com/Maeka/UserFiles/File/varibapugutijuxozefexixaz.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ff23105cc---zalopomunezo.pdf
    • http://xn--b1agjlwjc3g.xn--p1ai/ckfinder/userfiles/files/70123242318.pdf
    • http://www.annaleehuber.com/content_files/file/kikazuvelivefu.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef5cf2a0f9---65789653570.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16070150ece84b---84528816966.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/j0aavsio30iafqt1tc3q75hskn/rexugor.pdf
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/e2add514dda6197936ae8208b8d23d26/69881637183.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/15522666180.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+aim+better+in+pubg+mobile
    • 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_off0000ee13.bin
fd6f46387efcf4c55cce82866491a1c9aa16995df7f7c9788c74bd97c6a65d06
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 16672 bytes
font_01_sfnt_off00011978.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11978 16792 bytes
font_02_sfnt_off0001318f.bin
3d5edc4493ce5227fba763ce180dfccaf87a8cf91c50e112b64962e077379bc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1318F 10744 bytes