Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c574826793b7d6…

MALICIOUS

PDF

90.0 KB Created: 2021-08-11 05:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a99b88999459102cdf6884e9f08903db SHA-1: c94727af473b4d9b2ab35a420b2b2e9028a802aa SHA-256: 42c574826793b7d6049bf1a0abdbbb262fd0bab138ab9995abd9c21137c7e0ff
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories, indicating an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the structure and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://abeess.com/userfiles/file/9386563460.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4f5d051dc---nekabomifineximavodusep.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/d586bj6p6h70ncccqgua0lkb85/buxejenonakojeginajuruko.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/1b70ed9176c8e321f840bc5d6069b560/sesuwak.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076237748835---60692536925.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/hjat3crvnhor3td8t8ps70ap3h/4737773938.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/h36kk74fpgvlsag6ej8a8eqtm6/76792685001.pdf
    • http://anoh.net/pds/userfiles/files/selefodokepopesoz.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/jufipadezatemu.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4mdhtmum2af2r0pf438033mk1d/23641852752.pdf
    • http://velo.hu/UserFiles//file/61916839811.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/f47bfad293cb787429e3edad1074d8d6/wiposagal.pdf
    • https://harkakotony.hu/UserFiles/file/pujekovobid.pdf
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/68982754215.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079760aedfc0---watilupegez.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160983bf935b27---jelalomaleputofasogag.pdf
    • http://kaiyudachem.com/filespath/files/20210806130225.pdf
    • http://lifecare4all.com/upload/files/vegudegovivofa.pdf
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80d00f6eb---kebenesejigifirugobog.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/87e04c13b8a413e9b7e0a99d334ab7ac/kowadikenejalepizivamilot.pdf
    • http://rococosofa.com/files/files/84007907916.pdf
    • http://latexindia.com/userfiles/file/21366534564.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/rovafumu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mitos+clasificados+1+caballo+de+troya+resumen
    • 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_off0000f597.bin
836f4e84b5094edf0c1ae781979c694c314cc36293f7456c4f78c323d0f39c9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF597 18960 bytes
font_01_sfnt_off00012592.bin
b75af5accc56fd61b970827f829405c50eeadcf833709be8ac2ddfe375cc1713
pdf-font-stream PDF embedded font (sfnt) at offset 0x12592 11036 bytes
font_02_sfnt_off00013f5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F5D 16792 bytes