Malicious PDF — malware analysis report

Static analysis result for SHA-256 765e8b0092ed7a53…

MALICIOUS

PDF

193.5 KB Created: 2021-06-27 21:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf4abcb2d7921053cf8c44e021e8ab5a SHA-1: 393a3333930190021925edaa6f0bcf020a18eace SHA-256: 765e8b0092ed7a5367f2e7dc1d47691152b00c8eb4a64006e4bc35d47d37e88c
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic point to a campaign leveraging compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d555260367---wulefufezoxo.pdf
    • http://hurtmar.pl/Upload/file/75240832336.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/pr8jlhjprmdpo3an36ndon03ir/tofipenosujizujutex.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608790504847d---69453829468.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869d9d4373d---2759616347.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a24e2b12d8a---45741096315.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/c51ccf183a9b4f558a5bd65e95d7046c/zazozino.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9a130025---domopesimajuzekofatoz.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/acm1q61d78me46bkup7cc04a17/duvaxebevixe.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860e5153476---tujexizoxuxepat.pdf
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/35f77e75dc8f4e619692f87c31ff8faa/74392106270.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/8eab00dd8f44094ec8295039e0039597/lijivapobajor.pdf
    • https://robertbah.si/files/file/potepojav.pdf
    • http://sjar-tech.com/uploadfile/file///2021052509001397.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16084863937e89---wujuzobaloziwazuzene.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/694d75d250818c9edcf29731368f833d/72105617154.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0399edb011---fefonanaxuxosikif.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e062e0311---18226436818.pdf
    • http://ducthoaudio.com/upload/files/77143609306.pdf
    • http://asustainable.com/global/file/nuwunu.pdf
    • http://porpora.info/imagenes/imagenes_contenidos///50489954671.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/2rv30k6og2ha6aj3r7eopkjsdh/jilenovatixogiro.pdf
    • https://aspirans.com/files/file/zefuwagutobuvasiva.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/74397159377.pdf
    • https://mimpi1pusat.com/contents//files/69980860804.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=henry+mancini+sounds+and+scores+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002952f.bin
94cf5e7d97761b64904bc6eef99869da0de45e5af93ffb60cf6349a9aab3fc66		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2952F 18980 bytes
font_01_sfnt_off0002c6bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2C6BB 16792 bytes
font_02_sfnt_off0002ded2.bin
3f3c202684dece27fff70552fad7b051361bf22f0286f12bc080bce5289f1fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2DED2 10840 bytes

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