Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad200c241d72fe8a…

MALICIOUS

PDF

94.2 KB Created: 2021-06-27 06:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3aa683c315a53c361632bb99352c636 SHA-1: 01130870e51287663fcb0f73978f788496f5c6b9 SHA-256: ad200c241d72fe8a5acf51f64a13644e67740aaca9d1facc7dc3d712bb3b9a50
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristics and URL analysis confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/71a5fc293898d433eff6acf5ed228c1a/80505877696.pdf
    • https://noddy.nu/images/file/66588187861.pdf
    • http://kolkandkolkdesign.com/site/data/ws/files/sazitovewa.pdf
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/lejadar.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ab50c87cb---96608144121.pdf
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/270432d1ea2ca4588af8c8346470b157/46617573858.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076f2fce5a4a---junasixulu.pdf
    • http://www.contal-farmer.com/uploads/files/24309143849.pdf
    • http://trans-serwis.com/userfiles/file/radimixi.pdf
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/fbed24aa5772c9726d4653abae4d7f21/13459817770.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/7a3fd0a1d92d612ea73e4ca49e672d1a/41002621808.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ca00455c48db1ede8bc7656e21c3f997/boropizumademawafonidok.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/583358bc3a6ea222feeaa2606089be96/6787445760.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083401c9087b.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c2e8275f4---62896407715.pdf
    • https://eatorhours.org/e-bussiness/fckimages/file/12701312206.pdf
    • https://rijst.nu/userfiles/file/velizemalulovoriwojuvojel.pdf
    • http://www.stemcellhairclinic.com/files/files/tasetafedomuwuwevu.pdf
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6bfcc8949---85009780248.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/p6m727cm87in9ujd1p0o4dbeap/puzovovelojelaxepiginili.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078f6a8c65e0---saluvefiziwepogenejetes.pdf
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160815612b743f---jefewedaforavak.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801efdc894a---16857525342.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/e992a17e6d147c62d4c82a1a0c1c7c76/15695871796.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+human+centipede+3+online+free
    • 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_off00010a71.bin
2f416c3cc0d0a004ebfdca1166e632a62f038ad04787deda0bffafe96f61133a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A71 18812 bytes
font_01_sfnt_off000139fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x139FD 16792 bytes
font_02_sfnt_off00015214.bin
f2fd37c4fd46f3c2e8a74f9c27438d77ca35ee4ae22a4ea7ce4737646e2eb44a
pdf-font-stream PDF embedded font (sfnt) at offset 0x15214 10952 bytes