Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b7bccefb51a7d3…

MALICIOUS

PDF

90.8 KB Created: 2021-07-07 17:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b772b7f150d23d5623309a97c89c7a9 SHA-1: 707a2024ec840ca05c88792e607b5ae50706b5ab SHA-256: 42b7bccefb51a7d32c902b06e6961cea83562ea530d391886d8ba234c403a5e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload storage, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://epiphanych.com/images/file/jeroba.pdf In PDF document text
    • http://farmina.ru/uploads/files/47603614938.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609faf32a9809---63540658180.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/22287700641.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/24893575391.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/aa96e22668012338df68cc13596a1964/gisozutagabor.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160997506a6aa3---14974484505.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/s51s4cg4fa2ccv5patic7jpuu6/83450434250.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/bimazodanodamadixewusuket.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/11543a1dc6762813df3bf25294b46480/68054512418.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5460339ff2---mitasivopetuvozopome.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ada2aa9f88f---xokofubonekabogaza.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/zajigesaxoxazegur.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/28278169579.pdfIn PDF document text
    • http://yesilderecine.com/admin/editor_resim/file/49980634939.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/mekosanezozesuwusoves.pdfIn PDF document text
    • http://nonstopsushi.com/uploads/files/5584565645.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jooprpt1ae2mnmm3q2boj5rbji/35393487447.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/jagilakafagat.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/4389234625.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/37795814112.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/36463654007.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8678dedc6---64539172738.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/nobewipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pollution+articles+pdfPDF 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_off000100b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 17196 bytes
SHA-256: 907c759ed2a0f5ee3f2ddeb296633c580c39a7cc43d106e050567cc610e42d49
font_02_sfnt_off0001458e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1458E 10712 bytes
SHA-256: b4303d76cea17d2611b7babb6740d9b7f7cd8bb6b6c00e6b7ba7c403cf50c8f6

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