Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8b71f2d3797a89…

MALICIOUS

PDF

92.5 KB Created: 2021-08-03 15:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68f1299ef420fc72e48dc3699fa5a3ee SHA-1: c30070053a24a7be172f322663733f8437517156 SHA-256: 8f8b71f2d3797a896161da04fc1ef0a228a96d594eeaf0479571647e07b6a8bf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns suggest a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=neutrino+plus+hack+mod+apk+download+unlimited+diamond
    • http://guowangcable.com/d/files/lufareworip.pdf
    • https://aventura-agence.lu/userfiles/files/53780639141.pdf
    • https://aquarell.ro/userfiles/file/64325322806.pdf
    • http://dansecyr.ca/pdf/file/dunetadawuganipawoxo.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/75210fd8e556de1def647ebbd4be4f72/60805632984.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eb557215---38143176936.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bf0f30ab1462803c9181027cf6c55116/70329788756.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/dttapmm28rfbskkltn5veujbq4/wigagiwatuvijubifaku.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16aa70daac---retijijekavajasufabife.pdf
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/fumowutaludumabejefezut.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/951b840ae3ab5b1e2e32bdfaa417eadf/31335147343.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991767a5194---70245534798.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081efa639507---jetotiba.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/aa596285a599583ef4fbcec47f498529/23314106787.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160dc0f616ddb8---78174482864.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d53903063---sefosubukatofedusipug.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dde0f8e9502---vewunedisetevutewutukixa.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/43093615871.pdf
    • https://sharmtocairo.com/userfiles/files/33933582216.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/57a5e4db297610811fe473b39d7a83fc/mitasotad.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/rccbngek4b0kkub20msk8l1p88/babipejuxelup.pdf
    • http://dalnoboy.org/data/filestorage/upload/files/15608634310.pdf
    • http://deltastal.ru/userfiles/file/35447067854.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6e2dbfe1---getovitajutas.pdf
    • http://mediedil.eu/userfiles/files/xezexopojuminavuni.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed6c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED6C 16792 bytes
font_01_sfnt_off0001057e.bin
bbb31daff9eb23a0926b85de7da7a7b079d5023c520e8b5caa620b06767bea5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057E 17356 bytes
font_02_sfnt_off0001324e.bin
2a28f67ab8befb1f1398560d33b630e58f93fae063f999d7879c5e06a37d8325
pdf-font-stream PDF embedded font (sfnt) at offset 0x1324E 11036 bytes
font_03_sfnt_off00014bd7.bin
8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BD7 16060 bytes