Malicious PDF — malware analysis report

Static analysis result for SHA-256 24796ae0f9b03fa8…

MALICIOUS

PDF

74.9 KB Created: 2021-09-08 08:14:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c5790baf0292cd4988f5e1c001cb8b8 SHA-1: 8ce3474b9d859273121dc29400f03c97264490cc SHA-256: 24796ae0f9b03fa84ebf6b5cf6dfcba93be557351f5483b4295a9403d47ce1f3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The file's structure and embedded links strongly indicate an attempt to lure users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://workontext.ru/media/file/nifivek.pdf In PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705b7e21aea---39264379905.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/virevepadojasafujegazojur.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1607b26fd51ba5---pudelukom.pdfIn PDF document text
    • http://aimic.com/userfiles/file/welugapolosokano.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ab44a221e540df41815fe6a3441e668c/desabefowoxuwefugukazutak.pdfIn PDF document text
    • http://skikk.eu/app/webroot/files/userfiles/files/doponix.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/nojolafaxosodefalazotive.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cu0eiqq8qlbhrnv04jejt3gom/85518680354.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/8efff1540b887c7fa081e32d519fb718/wedipadelapujuniza.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/bifelulizebevuguwuwel.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106140037597512.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/77035008839.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/lofimitozarojogujabuve.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/taposiledigonizovir.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/potode.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109012106529087.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/qkqmo7b1586ghk4rshda3a07o5/17200036862.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/15733910289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=carroll+diagram+worksheets+year+4PDF 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_off0000c0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 17040 bytes
SHA-256: ef69c055ccfe283b2385433e50843a3cf686d42b2a9bcab1195a8c414e7a31af
font_02_sfnt_off00010506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10506 10992 bytes
SHA-256: 7b7bc822e8c1d1c7aa562ab63ace6cb6c2f1198291c47f90484e582763eb9dca