Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b894268a2506cb1…

MALICIOUS

PDF

80.5 KB Created: 2021-09-08 07:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 379605f77800234ebd22651910068416 SHA-1: 0ea1d2967f07c36102f0de38a7519498546b7bff SHA-256: 7b894268a2506cb173b34e20ae8f5ef6490be5694307ec654002e5ad0bd98cfe
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://tajilin.com/upload/files/tokojetawumawewik.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/c8sdg0o32aadu5cd0tls6l5rv3/30376789713.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/cct2epgu1gp098v1lqo080mgp7/zejuvifar.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/bonumejogefisulijajotun.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/61122512458.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/32001321874.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9dde25a12a---83308768007.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/281a01876cdb76ffe08d9a467606ad06/fazelozawimo.pdfIn PDF document text
    • http://doreenindiatours.com/userfiles/file/18567149910.pdfIn PDF document text
    • http://ronniejoymemorialfund.com/clients/1/1a/1a75100f29d804137a154ca93ef51a80/File/88787676224.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701af7a6207---96450384500.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/3359e11a3cdfa904d3c9429ac17cbba1/74091546183.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/xirekovomi.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13318637579.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/jimawaxorugedukubanu.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/103f036779d569edc10ed1f143ed2d64/47499980908.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/df0bbacde62abf1d89293057ad342ada/vemiteposuxap.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/460be47cab378f33d5891c09083836a5/65478778752.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/38085335806.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/666ee1502742711d7d60076ac3802628/sajebuxul.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/6aa08ed5a7b4d17fa5c530f520fc3c57/xesafurogokogipelevasaku.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/94ed667c009adcce8bab6c372f78bda1/wejotiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=prime+factorization+guided+notes+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_off0000cfc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D8 18824 bytes
SHA-256: ec0a007b8f61e37117a95ffa7983fda39a2bae206cc9657bc24d7e89959abd8a
font_02_sfnt_off0001188a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1188A 11076 bytes
SHA-256: 326abd0bf9ffe0b27a5a7915c5352e761d49e8603285c6548bd7661c14efbaa5

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