Malicious PDF — malware analysis report

Static analysis result for SHA-256 658904a8838211e9…

MALICIOUS

PDF

71.7 KB Created: 2021-09-07 22:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bc4f85e8c52c2381df58849a78457176 SHA-1: ae732a86fdaeb2b1aa17fa55b24148aed57aac6a SHA-256: 658904a8838211e9d832cd067afbdab4cf5ec3e375ba4ab4fe76d662fa707e4f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm pointing to compromised CMS uploads and potentially malicious PDFs. The presence of external URIs, including one pointing to a raw IP address, suggests an attempt to redirect the user to malicious content. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to facilitate the download or viewing of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/5e3fba8bb4f625afd655c5579a686b00/xukivetodowukobokatizu.pdf In PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/75065988476.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name//files/degezisixubejuxomipisu.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/bj1r9djbkeh5lpj6ib68ngj6fi/10440548486.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/78ec21484c3638bc602b08d88080ba90/kimevipexuvokib.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/zemediridesup.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a23937b40b---53794891944.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/12943690144.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/39301592350.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7e092f48524efc145a2a16b68a8deed2/50023683560.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/20497640064.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/41891599736.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/iocqjvep42q8qj78n2eruk3n8k/13424514220.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/luvewujaganupaxapegazoro.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/3ecd53290cf5a6fc40d0177af902a3fe/75071080028.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/3iqgu0igaapjf356aohijosloc/godetamitoziwogufebe.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a9d3987dbed99d18b0610ece39dc7cb6/40860085761.pdfIn PDF document text
    • http://billsky.ee/files/file/juvuni.pdfIn PDF document text
    • https://digireg.es/upload/bapalojerijajiji.pdfIn PDF document text
    • http://superpart.com/files/gabuti.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/butazawofupi.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/muxitebajepuwatirugar.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b4e62b2c---28144586553.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/zarozigifolezika.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cbf06b57c---968963685.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07680090ed---89764991661.pdfPDF link annotation
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=drug+formulation+manual+3rd+editionPDF 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_off0000b71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF31 15560 bytes
SHA-256: fa3dbe89d5534694210069e4805b7691dbe97111a0a63f037ebe0a953d93bd3d
font_02_sfnt_off0000f692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF692 10800 bytes
SHA-256: 39279838fe1136e0b54679c6c50877952bc9a3403a3bd744d4f0d707e71e8b16

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