Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d3fd18159c7ca8…

MALICIOUS

PDF

104.6 KB Created: 2021-09-03 15:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6266514b53fc09bf2630b05cbd78c870 SHA-1: c4b79a74757a9539146d1808003c999b0b0ce194 SHA-256: b1d3fd18159c7ca844d844a108b48041543aafa88c5c4dce77455fc98a403b06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host phishing content or further malware. The presence of external URIs and link farm heuristics strongly suggests a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://crysiq.ru/uplcv?utm_term=punctuation+worksheets+with+answers+for+grade+10 PDF link annotation
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/6d2e7d255e95f652bc79562c2ac076c6/davopejopetimasusevami.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/79844024548.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/25824949661.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/99840080476.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/ritetumubive.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160afb6af2d6da---nusujijejutipakuxumonof.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/49566262385.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/46496389278.pdfIn PDF document text
    • http://diencohoanghuy.com/media/ftp/file/zokoleperimutorenu.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/37391606692.pdfIn PDF document text
    • http://taxfreepoint.com/file/ditimanibodurela.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/tidekajikogin.pdfIn PDF document text
    • http://phukiendoxe.com/media/ftp/file/27470955014.pdfIn PDF document text
    • http://accronline.com/userfiles/file/zavudubaredaxotave.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/gekajidapujemoje.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d350a67b6a---fubevudivibet.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/vufarawowekivatebal.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc2dc9aa31---12927213723.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/xanuxo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b62ef2925bbb54334a6d758b99492e21/favolukekujokekuroxafo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e4b0fb1ddcb---42570438259.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/mobatavomenuvumedumagaxiw.pdfIn PDF document text
    • 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_off00012e7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7F 19804 bytes
SHA-256: e7357a15858f1e3509bb21cedb5a0d1e4dffb4e353ba43227cc1b9cb8663db5f
font_01_sfnt_off000162c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C5 11160 bytes
SHA-256: 448ad69c7f1f21307d465723ba91189ce5004c62829db027058f907f2c287730
font_02_sfnt_off00017cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1