Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f5706194b6e15c1…

MALICIOUS

PDF

88.9 KB Created: 2021-06-26 12:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8729d1790af2c6e5553c6a5c0e875179 SHA-1: 2285e4d3fce0e5bc76fbce40e9ece13abee6813b SHA-256: 1f5706194b6e15c17483ad7ac733f9f5994d77484e3eb5f2a0d5bfd959b6e28e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous URLs hosted on compromised CMS uploads and disposable domains. The primary purpose appears to be directing users to potentially malicious or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c2f8df34---67166728856.pdf
    • https://invest.pl/userfiles/file/sufipuvuwenemarumudasota.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9b2a2572---volezemimelogu.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a43ef693e58---mobofasukanux.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87be8c1d5---kemafaropimilukamiketuf.pdf
    • http://fobas.cz/userfiles/file/79465679892.pdf
    • https://egyptsuntours.com/userfiles/files/pibune.pdf
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/5c24b544cefa019eaee76b54bfaac0af/94628591233.pdf
    • https://mimpishio1bet.com/contents//files/janidukenemolipusigojon.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d3ebbe05f97e987980810fcce47b8fa0/lisoperakarufox.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/n12m6kun6v89c5j12e48pghqo1/5646027075.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f303c563d0---95237134460.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607517341a2ed---41182039010.pdf
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/cq1vclgcg4an90ag89mvtb0mr4/59781803167.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/t9con3vqn5ava9ig9mk90mdern/bebofigelanokorapibukenu.pdf
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/v6ov385cj7i8p3d623gdg79odv/95955315428.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/33141186c037307da0766e5d9d26a6ff/4234430299.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/5d217b05129da4558035fa596ea20621/noxozasuxigulo.pdf
    • https://chrmglobal.com/userfiles/file/suwavusafojobuwiva.pdf
    • https://bcbc3399.com/upload/files/gewozuta.pdf
    • https://b2b-intelligence.it/uploads/file/sureranupawoxesaluxepise.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/6721f672fb63749b1971b89736c1b876/76691617631.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/87930a5153dc2e148cf17e8172b469d2/jemebuvo.pdf
    • http://teplospectr.ru/images/files/fagevoraboxizu.pdf
    • https://loyallcanada.ca/editor_files/file/napolokazow.pdf
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/955bc22b8076ae02cc34bcb9a97f603c/panerusejipegut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=cfc+refrigerant+meaning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa27.bin
ce0c90bd9320237ec148730a83e02682a74754747693a1bd380986d5f04fc282
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA27 10376 bytes
font_01_sfnt_off0001119b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1119B 16792 bytes
font_02_sfnt_off000129ad.bin
d449c8a2925ccf79a53519053e0e661dc0bd387c2848f7d041b8948b99665fb6
pdf-font-stream PDF embedded font (sfnt) at offset 0x129AD 17132 bytes