Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4677b2b139a946…

MALICIOUS

PDF

94.6 KB Created: 2021-06-25 18:05:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4fede50d05df3b870e030522a87a76b6 SHA-1: 2fcc601ee353c6de65a0160ca1fb1d0e4ae440da SHA-256: 2d4677b2b139a9468268db047d89b10ee3969a1969fb5d883601fbd965373323
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier with high confidence. It contains numerous links to external PDFs hosted on what appear to be compromised or disposable domains, suggesting a link farm intended to redirect users to malicious content. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://taechoclub.com/FileData/ckfinder/files/20210606_AB968C0D51AFF4EF.pdf
    • http://dush-kz.ru/uploads/fck/file/kesikonaramexaw.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095d4c4367f0---22488567093.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160b77293e2e79---76589604544.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/7fcb9306bf26b23896ab6b349c5ed38e/gokaseviwez.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16073f20ebe5c2---nepoxogatobabida.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab491e76cc---52277591196.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082e5f3630a2---52272305255.pdf
    • http://evohome.pl/userfiles/file/fexarofonuporexu.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858faf8d5e7---ruwasidur.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835053b7869---58494656214.pdf
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3a67e973a---85126181178.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/5ho1i4tpd84gs954c1rghmli41/1892293113.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/6586c6929a459838bd0a08aceb61adc8/regijewojax.pdf
    • http://mg001.cn/upload_fck/file/2021-5-13/20210513221001501631.pdf
    • http://casaatlantida.com/userfiles/file///23890678031.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/dce0f4d4baf070c8e6958e39e50f921b/torilorexo.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084075287bc8---januraloxuzixaxesabodog.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/45b9fe76551049ffdf96f113caaa97ee/laxekanokoladerara.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16098d9b5e7bcc---32850070831.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad80dead41---bopatipepibamiz.pdf
    • http://dancedynamicsla.com/clients/38740/File/41009559055.pdf
    • https://jxloanchien.com/style/postimage/file/mulumakalasok.pdf
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/3f54a5c229fe422e75d94e51908f7a8a/budukadubite.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=regularize+3ds+max
    • 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_off00010e03.bin
a832e21cda384c339d11d2d0209d497ae03e560a66b6f618cdf3d1e3af11c086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E03 10748 bytes
font_01_sfnt_off00012695.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12695 16792 bytes
font_02_sfnt_off00013ea7.bin
8d84cab2a5b40ef4067c3e016dd12394e2c9491b47e90e82eaa4875e056c28ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA7 17312 bytes

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