Malicious PDF — malware analysis report

Static analysis result for SHA-256 afd919db0e68104f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-02 19:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 463308fa8667c299b7690476dbe89ba8 SHA-1: 2de2b5403b2e7bff1b2660f13c2c65f2a0bf6b55 SHA-256: afd919db0e68104f0f7228d984811568e9b62fdeebde1ed5a02807e92ee3d9e1
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating it likely exploits PDF vulnerabilities or serves as a phishing lure. The document functions as a link farm, containing numerous URLs pointing to compromised websites that host further malicious PDFs. This suggests a multi-stage attack designed to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://podlahypilat.cz/admin/file/73855510525.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbb5101651---gukelo.pdfIn PDF document text
    • http://irinka.org/ckfinder/userfiles/files/bomilet.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/65a956c1b30a7fa39b87eabd86f6dc51/nejutitidanaxalali.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2665d2f368ba1b244b2cf2d595722103/lurasosoro.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/povuvositodapozo.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/3nbduak010mhjv7g7c0hu09ubo/fukinowavokuborite.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/suruwikezegikew.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/0233214f280defb43f34bfacbcd93fe0/reropod.pdfIn PDF document text
    • https://capecoralliving.com/media/file/60160240984.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/98843193038.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b555c890d---83582423986.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/paleriwakasuroposobu.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/bagawutomexorenuwi.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/jamozix.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f83a8906ab---zavukedozememuxajojapoz.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/qhteok6s42r5c8n3q9spm835f2/7721574005.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/ralexunudanira.pdfIn PDF document text
    • http://entrackintl.com/uploads/fofesuzok.pdfIn PDF document text
    • http://seamacros.com/upload/file/wizotewikovoboviwij.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/18476189397.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/9a26d8b7a84124faad20f5522aae2c17/98815754546.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/vetepa.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/93879545566.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8884b18f0---44987950254.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/23988516353.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/kodegetotajuzalado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=microsoft+financial+statements+2017+pdfPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28D 16724 bytes
SHA-256: a943f6c26cfe06254c4cd435af9b72d440777e7094442072e244987818344cb9
font_01_sfnt_off00010d4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4B 11116 bytes
SHA-256: 3a987d396b6ffaabc94f2df0c9dae494d6bd1b600a5b9fe94501b499c1758ac6
font_02_sfnt_off0001275c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1