Malicious PDF — malware analysis report

Static analysis result for SHA-256 41561aef7617bf6b…

MALICIOUS

PDF

84.5 KB Created: 2021-09-05 01:52:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdc341da6f59da656ba0871a58c64154 SHA-1: 8f5c9d46632b39568c84fca1a85ecbef2af1c317 SHA-256: 41561aef7617bf6b7b0663cd9494ade0f99ee56fe74eb27e03e6b4f440489ab0
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, many of which are hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://omak1968.com/clients/71178/File/rufakevufixisi.pdf
    • http://thaimassagemodel.com/ckfinder/userfiles/files/pawikaminuxoxedusunir.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4e153bdbcfb932ef2394ab27db378cc1/gevabakexolituzaxut.pdf
    • http://galettedesrois.hu/userfiles/file/gamufuvesuku.pdf
    • http://sensi-leszno.pl/userfiles/file/25830260536.pdf
    • http://labonscafe.com/userfiles/zowelerag.pdf
    • http://lhsclassof68.com/clients/73441/File/tuzelud.pdf
    • http://www.pzkexie.com/up_files/file/62619912371.pdf
    • http://safiorida.nl/operatori/userfiles/file/31911996426.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32295a5542---15258174398.pdf
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/a05eb6417bbde01975918c074b99ca89/befizogemusisekurasulev.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/enuh0o76aghrok2ti50t4p5594/26504886018.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/h1l95tmvoft1tq9bvlv9iabprl/2231677269.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/53a1d2408dac9e80c583cdc1e3b7a16d/59431068256.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec81d11294---ginonogojemekudo.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079bfb9af25c---futelowizexekobiwuzogim.pdf
    • https://soudurelauziere.com/upload/editor/file/sewape.pdf
    • http://penzionnakrizankach.cz/ckfinder/userfiles/files/rukar.pdf
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/73019260884.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5411b72bc41a45f3b257602db1dc3ed4/dawevokarafoxironodotemo.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfc6f844d7---81732725123.pdf
    • http://chongthamphucthang.com/images/news/files/53569247350.pdf
    • https://digireg.li/upload/doguvefuse.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=rapport+de+stage+bts+tourisme+pdf
    • 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_off0000e15d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE15D 16792 bytes
font_01_sfnt_off0000f974.bin
6babc9e735de8ce4bbd4f94a1a6dd995b64e99f577646569346ffef634a41303
pdf-font-stream PDF embedded font (sfnt) at offset 0xF974 10976 bytes
font_02_sfnt_off00011292.bin
7a0bff4ec598dd44cc2309458ab443a7993ef4e186a82d291f8383acbc12cd0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11292 18880 bytes