Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea071c7f4189beb1…

MALICIOUS

PDF

90.8 KB Created: 2021-06-26 12:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e28c4b39aea959588b49b8a1aad31b90 SHA-1: ce9fad3ee5000b2083a9ac62aa30cb86a3b3eb38 SHA-256: ea071c7f4189beb1a27779b416d05a18bc25417dcdf687e92c8272849aa70204
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to external sites for further compromise. No scripts were extracted, but the link farm structure is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e69f1c7bc594e0d5ce46cf4117056a46/73587629665.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082846eec301---97963836053.pdf
    • http://susanirvine.com/clients/82887/File/83676195905.pdf
    • http://nage-z.com/ckfinder/userfiles/files/tedozabefulisodomobebedin.pdf
    • http://inezorviskids.com/clients/37546/File/7704374501.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bae889c1248---guzibijeme.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/75b2l2m4m502jv9v83bhm54en7/likotijaxomo.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608637da7bf6c---95775839703.pdf
    • http://csc020.com/userfiles/file/20210623221724_ohlkmg.pdf
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/25168161534.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a451f66b142---10070026716.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160821d14b6f6d---70741102850.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/47325792649.pdf
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/72502468153.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a3e2843b9f9cc39f7d204ef1542ac0c8/wonosutamuveg.pdf
    • https://bestcoloringpages.com/userfiles/file/ropixefowuwexajudemake.pdf
    • https://sukhayurveda.in/userfiles/file/71908885078.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/6c0acda26247356f758edad27c0af38a/mejuvexu.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/296bbdeb91e9018ceb8d9503c71bc2ee/wedefojinumuzuwosonexev.pdf
    • http://111-orte.de/testarea/cwsCMSlight/media/files/boxowalozupu.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/66cefebb45b76b80683dfcd73383f03f/pudaluduvefapapefurux.pdf
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f20e089d0---nomojepabisitu.pdf
    • http://kagoshimakojintaxi.com/userfiles/file/dimesuxelatiw.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/cujtkv99pjt6asdrck4o7hi691/jovesabux.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/f332fcbe89452bfd6bb07f2cdc539eb0/27151034426.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a27d5b9e1432a03bb6886b2fe358f6cd/43020435716.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=tickets+to+cuba
    • 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_off00010419.bin
f90c61ce7406b5d1cf78eeba32de3ceb766ff3ca9cd2dea116497c017b6076aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10419 16496 bytes
font_01_sfnt_off00012ebe.bin
5e014aa57b82ec62895490f3ad87517ace98ceda58fbaaa89b11445678f00ad7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBE 10268 bytes
font_02_sfnt_off00014617.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14617 16792 bytes