Malicious PDF — malware analysis report

Static analysis result for SHA-256 9611aa7c798c6e47…

MALICIOUS

PDF

92.7 KB Created: 2021-06-29 19:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 33376fee799375bc8baf5c375c4ddf9a SHA-1: 12d80f4d03f5af23915dd46632495d03e39939ef SHA-256: 9611aa7c798c6e4712f28290b334083bea652afa0fa286c66212873b20912321
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ac7596433---35880684503.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a9164417---visatubosadaxogufenadop.pdf
    • https://tolgyesvolgy.hu/userfiles/file/natipelugepasagawopote.pdf
    • https://cqc-material.com/app/webroot/userfiles/files/pezutomipobadesemipeli.pdf
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/pojosofoderujaki.pdf
    • http://www.alfapilates.pl/upload/file/89569407772.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d31797e6bd1b14ccb5a1288add3d3596/50488471011.pdf
    • https://melz-feu.ru/upload/67502388623.pdf
    • http://huucodatlanh.com/userfiles/file/78770406538.pdf
    • http://www.herbertvanderbrugghen.nl/draft/10323330808.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d3a73d647---fugezudaweboxaligakoloweg.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609978a836025---11247320390.pdf
    • https://soechi.id/userfiles/file/kivinunux.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac48e597b4c---2072678648.pdf
    • http://bakoca.hu/files/file/fatufubozusikigorar.pdf
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/teminaxunir.pdf
    • http://sns-russia.ru/userfiles/file/78594303308.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c573fbe000f---nanujopabitibijekub.pdf
    • http://vuason.vn/upload/files/64883270391.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/e50d39e0b97b8d7d392a1e29a355484f/setawekologijerizokolelus.pdf
    • http://whs1979.net/clients/65916/File/22539260275.pdf
    • http://samnakthodrahassob.com/userfiles/file/6316068846.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4820518230---romibabenepigilapib.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accec2e70be---xatelifof.pdf
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/40469155859.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608978b85c5b6---tubijelibimikesapebezuni.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=cleaning+garbage+disposal+with+ice
    • 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_off00010712.bin
e55c76e5efe511af6e33f83e5f9e6c550c09a7cdeec0e38a9e4f485124669841
pdf-font-stream PDF embedded font (sfnt) at offset 0x10712 17272 bytes
font_01_sfnt_off00013423.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13423 16792 bytes
font_02_sfnt_off00014c3a.bin
d85f07ab980161f7a882e1d1eba32c729024b34ad88d931b5743cdb3c0f66464
pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3A 11048 bytes