Malicious PDF — malware analysis report

Static analysis result for SHA-256 ada89449a1452c4c…

MALICIOUS

PDF

88.5 KB Created: 2021-07-08 12:30:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df64577d1bd68381dcbe01b99f94e5e3 SHA-1: ef0c3ee7118c8d50efb8a091482951e1117261ad SHA-256: ada89449a1452c4c62f7f679f05de92ce6751d4adc77f50bf4dd12bd23162317
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=100+aed+to+pkr
    • https://tiklatakip.com/calisma2/files/uploads/funeg.pdf
    • http://strahovka66.ru/userfiles/file/nifasanitijakurizamadi.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160830c0ea7d66---xesasubolifovipapalelesov.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/62eaa03db2d55f53cfdd7a4993c5e425/zisapenevupenonep.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a214620d33---fixudogelulogipo.pdf
    • http://movementlab.dk/userfiles/file/469515835.pdf
    • http://danies.ru/ckfinder/userfiles/files/kixazobitejumufisuru.pdf
    • http://31kouqiang.com/userfiles/file/1624928572.pdf
    • https://go2germany.ru/files/file/49761042054.pdf
    • http://ping-property.com/user_img/files/9308383830.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c07edf020244dfb429f01f713e9df18e/xosifatexeripipofino.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16087f5b789d1f---zujukilon.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4cb4743f110503b40f621373ddb2480a/46396004292.pdf
    • https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/08c81bb05b4fb75e0f00d15f2e3a3d04/lezix.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff00293ed7---96683123352.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6a715148f---69804489700.pdf
    • http://vogiantinhmach.com/media/ftp/file/mujugixujox.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/htdtsk6nablgnodmsacneh4l10/gegunepob.pdf
    • https://bestrecycledautoparts.net/images_i/file/83258980355.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770488928eb---daxanokukokek.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090e5949033d---34832855940.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/kgvc64v5r6g7gk1l06ns4fbd9q/wojininilejotinejag.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef752b21dc---jilusepizobewanula.pdf
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/4e3c83dedd84d2e7eb30cb0c35f11b06/80809463352.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/fd0772e2aa726135096cb47f230b032d/zegerasi.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e191.bin
1b4367ef5ade2582b5ac30ed32a298cc7859367e0b8662cf2d9a2de8d6f5005b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 10144 bytes
font_01_sfnt_off0000f855.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF855 16792 bytes
font_02_sfnt_off00011067.bin
34296d05fc30300bff3d5c201dfa52c3e18d0b5e7100309145cd44cd3b719d61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11067 17012 bytes
font_03_sfnt_off00013d17.bin
cb22297cb345efa2b973a5529f7d34f362c2fa401ecec879e64cb16b1dda6a81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D17 16300 bytes

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