Malicious PDF — malware analysis report

Static analysis result for SHA-256 de482c5832bf721a…

MALICIOUS

PDF

69.0 KB Created: 2021-09-22 17:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8434bd1f924054a3b2dde9a64fa50130 SHA-1: d97ce4fe14c82cb4860d060c0bc944308cac62e4 SHA-256: de482c5832bf721ac1ad51fe9a8a54b6b6d91fa00f4efaf90059a1d28db50783
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://zulassungsservice4you.de/bilder/file/piduvejapep.pdf In PDF document text
    • http://dzstock.com/Upfiles/file/navabofamin.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/soxubinemulovepop.pdfIn PDF document text
    • http://rooptex.com/uploads/59862598018.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613215bce9696---91927529518.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/b58ae0e03b71869fcd007c15fed03f73/50193759622.pdfIn PDF document text
    • http://snkpost.com/fckedit_file/file///20210906_20_59_43.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/16834844060.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/161348e065640d---3841871719.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/toxidatasofigarezurozonim.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/nigemo.pdfIn PDF document text
    • https://penzion-palice.cz/content/bajolawelivopuvujetokogez.pdfIn PDF document text
    • https://kaparatt.com/images/File/66410632363.pdfIn PDF document text
    • https://wonkingchina.com/d/files/vutuzipefuxub.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/gedobufusuwodana.pdfIn PDF document text
    • http://coconut.hu/userfiles/file/difexosabupelaruwadulaf.pdfIn PDF document text
    • https://dhesient.com/media/80814788110.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0996de48---86955044043.pdfIn PDF document text
    • http://webs123.com/userfiles/file/wiwepisusijixi.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210906052612.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/f2e2e57b12fa1cc8cd70e432be2fdf53/movitutonezavoxigepa.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/93009701984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=sports+app+for+firestickPDF 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
stream_003_off0000c92b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC92B 15032 bytes
SHA-256: 3e04040e36b38ba107a314b121bb16f0c8c410f8006c5b3055a39d76125afe4f
font_00_sfnt_off0000b119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 10492 bytes
SHA-256: d1e2c91d308401bcab6d1c945ce2ed1e104c108928115c9625957e9f12acb7b9