Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8861935164a3a2b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-16 04:23:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ab9cd4cbe607ff7f82e51292cc1b7ff SHA-1: 37b8a5490c8f60384818b0f0f44ba29b8f0ac873 SHA-256: f8861935164a3a2b3ee4f91362c05739849ebfe05d90ec9daffcfc5b11d941da
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links to external websites, several of which are hosted on compromised CMS platforms or appear to be part of a link farm. The primary purpose seems to be directing users to potentially malicious content hosted on these external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/c48ca1440aa67ecd089426405ad1da8a/nalafazejelabo.pdf In PDF document text
    • https://kuzeyilac.com/resimler/files/fepimir.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/41760003498.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/35678605011.pdfIn PDF document text
    • https://designclarf.it/file/74680840095.pdfIn PDF document text
    • http://krcatikyonetimi.com/userfiles/file/36260753428.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/85377047719.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/fitubemumegokadozirevog.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f534b4930f9c7ba9852571c1179a638d/valiruzesazakutimivikop.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/5623ac5c7995a7d014e95451f4655b64/67874987941.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/80062017686.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138bf189336f---sabulesakafovamen.pdfIn PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/tasofimazivuwudi.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ogandp9dp3aqvtqkfn0ahsq9p4/guguwavukab.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/96443269099.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/wovebatefixane.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b916197287---96023133535.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/1a160726ae41716fdf81399df5a21fa2/zopowow.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/tisapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=elwood+canal+floodPDF 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_off0000b00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00C 9948 bytes
SHA-256: 8e857cdbccb9e8451f90e4e067a0a9873a3bf01a487d3acbdd00a8deb36b3b18
font_01_sfnt_off0000c629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC629 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE3B 15192 bytes
SHA-256: 6c0a54c5334d868cb628d29c38134d73bd50e09e0ecc360e77cb20ce956e391d