Malicious PDF — malware analysis report

Static analysis result for SHA-256 db986513369478d5…

MALICIOUS

PDF

73.7 KB Created: 2021-06-09 15:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e383d219b1956ef7b8027e7cc94a0d09 SHA-1: dbd2da9298b16b9c0ad8df0256099d793793c6cf SHA-256: db986513369478d59b52e75ff59a66bc68cf33989d5f82fa1fd48143c745baed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious, likely a phishing or trojan delivery mechanism. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm for SEO poisoning to lure victims. The document body, though heavily obfuscated, contains keywords related to book downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://wastran.ru/uplcv?utm_term=conundrum+book+anuj+dhar+pdf+free+download
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/2d88dd289f4c769ff03f274b19539527/nawugiwipid.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaee3b6740---solab.pdf
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/73996948388.pdf
    • http://ajivikafinance.com/userfiles/file/bovakade.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608240ab85e06---23947587696.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e32851ab0---mibaza.pdf
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/l22v6cf9ab5uqjodf75ge623v9/21466607471.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/1e4e8e2110e584b33e1a9271159b5b1d/7117261707.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83446b8cb---xuwatisigaxujetopinap.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfc6abeb7---34861884586.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/470b183f31f186ee1fe3c87e0133ba06/zosurezilala.pdf
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ac07f1a84---65581779883.pdf
    • http://bigsvatcharasith.com/userfiles/file/42108911959.pdf
    • http://yuha.be/_files/file/juvatatesoma.pdf
    • https://bloomeng.com/uploads/21201143512.pdf
    • http://adabaskimerkezi.com/upload/file/29856993902.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e2.bin
4d541a6c6b266d9d4d7c95188049d463a0ff40e75ba9111887b5e1ceb3ecc652		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E2 5380 bytes
font_01_sfnt_off0000f30f.bin
b67fc90fa9cb32dea83124e22d692a775d4f12852aad8470f95d8b427e2ef6fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30F 10952 bytes

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