Malicious PDF — malware analysis report

Static analysis result for SHA-256 0216609c178e8427…

MALICIOUS

PDF

91.3 KB Created: 2021-07-22 02:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d6ed2ea6c73cd2f967a114b9b771954c SHA-1: 768f0032bf95074513dffcaee29cce2bb692915b SHA-256: 0216609c178e8427acc5f824a41c554760dc6af48398f5f3a8b6f55777dfbe00
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous other PDF files hosted on various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to click through a series of links, potentially leading to a malicious payload or phishing page.

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://viswinkelindex.nl/images/uploads/ruvijepokipunawibo.pdf In PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781175a3105---tizadarurabinumasufu.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/87663867310.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/40879586505.pdfIn PDF document text
    • http://moodyhighclassof70reunion.com/clients/2/24/24f6aee67edc386a60746049a176a33b/File/42761529885.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073c53d0f685---vusixijo.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc9fddd6bb---fozopinitibodejoxana.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/30801287937.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/16273811954.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/380e621de0d18d149a97d50b03e113a0/binejiwituwafo.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a88c3bd1c---89147532673.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/memiwaruxexijef.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210624151142_5jw01l.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/d3d0rsmam7bbhk47ejforg4e1t/95175962985.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/ed45de7a43facf0a23845f09f02dec81/99626168876.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/7g439jpkv1moqq54jmalpobl05/12339150934.pdfIn PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/1673115121.pdfIn PDF document text
    • https://menuiserie-sainte-anne.fr/userfiles/file/dozukuboletopotesafa.pdfIn PDF document text
    • https://cihangirhotel.com/upload/ckfinder/files/fitagudisuwawiwet.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/80033adcfaf5cecbef321ac121b18b44/gepuluvez.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/vaxogiledizovusepugij.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf498804c---12958749928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=payment+tracker+excel+templatePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001028d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028D 10464 bytes
SHA-256: 87498ede584c1ed6add4ef2c66c4c8e0deae33793cdadb3d7658dcd575bd1157
font_01_sfnt_off00011a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A56 17300 bytes
SHA-256: 52715354df36455b5c3a448455c66e3a1684ef081b57f50a82871c66db1d08f4
font_02_sfnt_off000147ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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