Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dd160093d8a0e86…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 23:50:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4125b22e879c9f44105f1755cc9436d SHA-1: cdf25b97b582d1985391ec5fb5094dd77e27914d SHA-256: 9dd160093d8a0e86fbc98694c31317cbd448dd02a51fe74597710b6b351f3f70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ML classification and ClamAV detection. It contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=can+i+see+who+watched+my+instagram+story
    • http://midel.me/userfiles/file/niperelitipatumumisa.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/dotizobukadeva.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/68420444940.pdf
    • http://sinproval.it/userfiles/files/ramizuma.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131f3ebcde80---93941600930.pdf
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/66392409057.pdf
    • http://marathon-gexin.com/Uploadfiles/files/vexosadik.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e6a4cce90---koteruzonojetimoxobofef.pdf
    • http://cesnek-vysocina.cz/UserFiles/File/bisegexorepavefoxukiwopoz.pdf
    • http://www.udelimpa.es/ckfinder/userfiles/files/bawubajosezosi.pdf
    • http://brette-animation.com/userfiles/file/40787681660.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/83870421749.pdf
    • https://canoe.ro/Extras/ckfinder/userfiles/files/66761509888.pdf
    • https://nyig.com/files/file/vumuwipupifopewabuner.pdf
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/sexogujolaguzoluwazineva.pdf
    • http://www.medic-pneumolog.ro/fisiere/file/53067260288.pdf
    • http://d2dgroup.net/upload/files/fuvuxiwewuwudalof.pdf
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/bavabuwemi.pdf
    • http://cityclick.it/userfiles/files/30749105220.pdf
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133be7d1e61e---gozisejirozefasevirabitox.pdf
    • http://szentimresiklos.hu/upload/file/33178024116.pdf
    • http://medicom.pl/userfiles/file/68802236345.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/boogln1adr09gi335olvh72ue3/48576075034.pdf
    • http://wakabaeducation.com/userfiles/file/wakuwiduneli.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_off0000e1a2.bin
5af2dfd5e2a4deb4d85b358b7548150a8a979623d0f3be799bdea9ea14cd5b3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A2 11004 bytes
font_01_sfnt_off0000faee.bin
7f0c64b10354a8f44243bcd2b030880d69376fd7af1ce43e40aa8143ef93a9d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAEE 18332 bytes
font_02_sfnt_off000129f1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x129F1 16792 bytes