Malicious PDF — malware analysis report

Static analysis result for SHA-256 f957828bd8e58a45…

MALICIOUS

PDF

90.3 KB Created: 2021-08-08 14:12:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c5ff5b0a78ae939d0defd399abe42821 SHA-1: b44402266dbaf553ab8de13183c0d3082c6c637e SHA-256: f957828bd8e58a45b02fc587e8aefe33c8da3aef853355ab6593d63b4389a5ba
204 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It employs social engineering by presenting itself as an invoice or payment lure, while simultaneously instructing the user to install a browser extension or update. This suggests an attempt to trick the user into executing malicious code or downloading a secondary payload, likely via embedded links to compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://beijinghuojia.cn/userfiles/file/gabiwazaf.pdf In PDF document text
    • http://constantemails.com/userfiles/file/1627591655naziputosolegopewifupipo.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/ruxefutede.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/69111647319.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/30648568909.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/xipabane.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/fobavugoz.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/luxobotidaxu.pdfIn PDF document text
    • https://rosenstein.lu/userfiles/files/80569906069.pdfIn PDF document text
    • http://ozari-ua.com/files/file/gamiwojumitolowedi.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093003d15d5c---pugivisufibevifuk.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e081a111bc5---6568518163.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3f86b37a---76892454822.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/ikfrd5b2aj31401j0cr6v27096/puguridijopaneveno.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/kpkvgl8ucd0kbelqunq3ov6aal/fowigewidebo.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107e8726c40b---lewizuli.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/651befc1e76ab6f08e5b2f916d13fcf9/sivagib.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/51759805091.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/0efab2d1836b92f44fee2366d23ebb09/31818576650.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88f58b5171---gozidupexuvejesesam.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/2132223543.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624288922.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4e656825c---55312294056.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/dolivut.pdfIn PDF document text
    • https://lepjunk12.hu/uploads/files/88963344334.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/dvrnkcbj7jsghjqd5pfe9l93ff/23325363342.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/3343ama8s0ah59bgnp7v604007/32612016060.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+write+cash+payment+voucherPDF 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_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 10948 bytes
SHA-256: 385c4ae8c6c6bddd1942b50165ae4e18694a581bc236560f19e835ee1ebde080
font_01_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 17628 bytes
SHA-256: 454121a76a9dafeadc38e0b21d24005aa6f1ab3947680e52568087172c8bb113
font_02_sfnt_off0001405c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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