Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79f22b21080f356…

MALICIOUS

PDF

90.5 KB Created: 2021-08-20 21:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e92cf24d0b77b33d961b80472d5d021a SHA-1: 617a37e23c41b1178693ef7b24564de661ad384c SHA-256: c79f22b21080f356f3893ab6822b90799e22df65f8a9e38f755373d9c9dd1f4a
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pixomot.ru/uplcv?utm_term=kaba+kamene+study+guide PDF link annotation
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/b2797f7448729f109b0dfbacaa545548/matupadonomiruki.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210609113540339451058.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/lotodibukukatedonigifojaf.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fa88c939202---dexigawapijaperidisipe.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/rogitudusubexi.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/84366937405.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/sexomapagemodag.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/66990702537.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/92525428004.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7523f3e8c---89958433087.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a4731ab92---83195940637.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9089653c14---goximojitewozu.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/73669627297.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4eb0d91c2---78026585466.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/pajajajeruza.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/outhbcedm2i5h4ndccme9laicb/lejubudesudumoxaniwi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/16459615486.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/6430f92ca904da70dc3fd938fbf79c40/savaxirit.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/63954684400.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cd5123254---zonuf.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/89683832621.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/71342757038.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/546a528fad6c6a355bd726921cf83a26/15933315395.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE654 17720 bytes
SHA-256: d707b2ef07ac0f31b0acf248a44df7e9c029e4e25bc440930081a414233acaba
font_01_sfnt_off0001152e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D3F 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000142b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142B6 10764 bytes
SHA-256: 9e05ea750efcc3a5fb758d1b86c546f5a8801fca8b7290790ba4e280a75a5ac8

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