Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4464fb90ce9ec05…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 20:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 583eb6f3da1bbf13ccce2dd3125775e0 SHA-1: 9cd532cb5e0b2c41cca4b6b8ef34467727cf4757 SHA-256: c4464fb90ce9ec053ff321691cdc10cc070f5bda1724c31555fb1eaeb2d26c30
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The presence of numerous links on disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/qug11utqjejig2ope97q7avfup/43274905125.pdf In PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/28742215223.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/4a706e5a3f56fe5cc53ad288445b3683/79191003933.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/55476611878.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/15720376278.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9c94c9a52c9a1e0406d1dab5d2ed0e0e/xabit.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b89c1d07491---lotopujegonuwinikid.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/95526609943.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085d58f017f3---62450866311.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16078bd7436f01---14796395909.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fccb7c2539---32713378690.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/toxupafisuwowuriz.pdfIn PDF document text
    • https://www.icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/62109450699.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lixananiwidilojoviviwesam.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bab1734d74---83633406089.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/tozemufeledokidilamogebav.pdfIn PDF document text
    • https://buka.ru/sadm_files/pikorozebuvugu.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/sakuke.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f1c9117b87560eb8d98ad6076a2d8eb6/62454261616.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/jaderexivuf.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160c64400b37f6---bevapugomulutugasa.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/52017795646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+browser+aim+trainerPDF 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_off0000d39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD39B 10428 bytes
SHA-256: ffb13e00a152050f23a08da7bed5de7eaaeca5079128416e9b85ed8a74e7d19c
font_01_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 18560 bytes
SHA-256: 05fa949cf70f565b04fffd16a2d7a1de77e3efadc1703606b9227ded3eed8621
font_02_sfnt_off00011a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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