Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f90e1152e65945…

MALICIOUS

PDF

116.8 KB Created: 2021-07-13 17:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1c86dd03d2ff7b8811f0c2fe3cd78872 SHA-1: 602e5ed3031b8ea89d1e36e93ab482f1b69e3143 SHA-256: 35f90e1152e6594529a8211bc733085c778b96fb8b5893c911a5be37b6357e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely intended to trick users into downloading further malicious content or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://oniceh.ru/uplcv?utm_term=save+pdf+in+word+2007
    • http://greenworx.eu/images/uploads/files/vazabebaxu.pdf
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/26667809948.pdf
    • https://perfecthospital.org/FCKeditor/file/xerilugexi.pdf
    • https://coil.hk/upload/files/94838774066.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/153c5eeb1042d422f268a482f970f1dd/58433114608.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/f10616655cf2c167efdb1315f0731fbd/pigisorel.pdf
    • https://phuquiland.com/upload/files/ziwevuvabujurozuvelome.pdf
    • http://domeinbeverdonk.be/assets/files/file/pevixokadizudojuxexorofa.pdf
    • http://babamoleskine.com/files/file/nusovogodakorelibonibiji.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/kni74phqotn3ihdtg3v8mo00r8/16214569796.pdf
    • http://baohanhranghm.com/upload/img/files/fekejatujabemejesagem.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/41dbabaf99d1888d6b370da22df91ffe/29299345716.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9gs9hfqd3ca09ooh2veda53qb2/megiduvuwojukem.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088d4b101f02---54935781192.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609144c6575e0---28737097493.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d35d4b2f9---tikijituvume.pdf
    • http://health-bridge.in/upload/file/furare.pdf
    • http://flexa.cz/docs/file/53629699138.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd7d69857c---40959450597.pdf
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc040ab8386d8afc3aa04ddac106af45/wibabeximowew.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/2c7cb914388e3094ffbe0460940a1d62/betupujupinefoserokadix.pdf
    • http://timeyear-v.com/userfiles/file/xorurewowumaxawabewiroxe.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16072eb9d6cf4d---89495267597.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/nadilqv8oebauesab5rdo6u7k3/92036852352.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_off000165e9.bin
cab4484341782b40789eb708e2129e3354bf13f7169adefe17cee120f4ba8036
pdf-font-stream PDF embedded font (sfnt) at offset 0x165E9 18060 bytes
font_01_sfnt_off00019518.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19518 16792 bytes
font_02_sfnt_off0001ad2f.bin
9eda4e25c020e05bc53c39f28226a639b6183b7b6f3cf14924783a65b44eaa57
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD2F 10696 bytes