Malicious PDF — malware analysis report

Static analysis result for SHA-256 df89790f0618404e…

MALICIOUS

PDF

69.1 KB Created: 2021-05-24 21:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 2840a2ebf3987636acf21c7f103e26af SHA-1: 98480d3b11053483f18f5337ea41fb86752e5362 SHA-256: df89790f0618404e626bfa550ac8d5eeb3a2702c4e2c59977c283e3ad1a20620
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS upload storage, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/diosed0pnurnuugvaec54fackr/xazujon.pdf In PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/l7km0aoc8039h6pjapmmee2f4s/50854286052.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/58474d9e494c6fa2458bdc9a8deb6d06/gomoketurif.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/d0epfdmligjr4rta5v5vq30jv1/19988997601.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/wolurowamekufewado.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/u6lq1e9lo5mfjvbsplnp2g9ip6/xipuwugarodora.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092a245dfcf7---dojivojob.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/58b1a859da4d6385093648884787327e/sofakuvuxadipalabod.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607023bee97ae---kezuxirejikazujinakonosiv.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7071c686de960ff900712f966f042681/bixukejuke.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/kixaxi.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/dukefulotiludoxivo.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a762a530c0e---lubefadasekigajavijafikep.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/32e7e2659d056f684c6cf1a0aded3dd5/garudatowejozone.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e01aaebac---59109160241.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lusirozunekiwozizemamim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+the+different+types+of+bandagingPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 5528 bytes
SHA-256: 9b61158d166866e1c17b3570a8aeaf1ec475634686ca37db172176a49ca4db66
font_01_sfnt_off0000e26b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26B 10408 bytes
SHA-256: cf052ca9e1f844dd39e0959bfb8f08e8165e414617c61875e7a7a24ccc9a3068