Malicious PDF — malware analysis report

Static analysis result for SHA-256 9407b1bab65ea83b…

MALICIOUS

PDF

87.3 KB Created: 2021-07-03 14:38:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 454b5f0e61e5ab4fbb8505f817ceb16c SHA-1: 34a7c9a17bdf130da6d48571f2d370d4a3c8899c SHA-256: 9407b1bab65ea83b6ab4d1c6a2d7ed34750677373abfc836b2e89c091235fed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://crysiq.ru/uplcv?utm_term=the+greatest+salesman+on+earth
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa16cf00a7---62581649683.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47621dafd---novasalipujaxizosu.pdf
    • https://torgradio.ru/new/files/file/77341698385.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/70b2afe7efb71e6f9c01f5ea3cee3f7e/pomudugalodobude.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e5f765e0---33413125815.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e825556a---miwuwupaleguwa.pdf
    • http://cablexconsulting.com/Upload/file/kewavinejepop.pdf
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/36894685584.pdf
    • http://www.findvoters.com/userfiles/file/riromebebefowenipi.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16084ca719cdde---29920508172.pdf
    • http://quiltingacademy.com/fckeditor/userfiles/file/bijamozavevevexewego.pdf
    • http://adveotec.com/img/file/fixurejuto.pdf
    • https://butchercurnow.com/img/shop//contents/15619229934.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160819d42d4764---54952297602.pdf
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/686dc5ee748cf04f58f96b7d34250180/66224979957.pdf
    • http://rajskiewakacje.pl/userfiles/file/48840228360.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/5504ae5ccb7d58b9a44263210f0b62b8/tavuk.pdf
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/2df610139bb24f03766efe60ab12eeab/wovotibugaxowipokik.pdf
    • http://xn--aknmedikal-yub.com/uploads/file/debebumuvovowupu.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/c594319dfb872e5f5493e58b0f88898b/90049714732.pdf
    • https://hophamthaibinh.com/upload/files/45840932583.pdf
    • http://beiwendq.com//data/attachment/file/96750494025.pdf
    • https://hsse.cl/files/56659092595.pdf
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/3613e10276898bab00af8cb5c135c095/92337959910.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/06de55520beaeb831fb36159b3acc6e5/jaxisunilomiv.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_off0000f3a8.bin
865a108c2f152752f6c7770541c57654ab125cab0b49cb1d1769c621c31e5819
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A8 10428 bytes
font_01_sfnt_off00010b24.bin
006f831eec950943350238e59ef340ffe469deb19feee704094f865ca815e846
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B24 17232 bytes
font_02_sfnt_off000137df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 16792 bytes