Malicious PDF — malware analysis report

Static analysis result for SHA-256 b86e1039c0c84de0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 03:15:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ee36e00997e743d8d07a201cbe9a38d2 SHA-1: e6b5d6abc47dc11aaca2c5e84c014e8f4ffeb1a6 SHA-256: b86e1039c0c84de08fba84209f396dad87bed04c69a67c8b1e52cb7c83c77d59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://purel-biopharm.com/upload/files/jifosoj.pdf
    • https://mbamantra.com/ci/userfiles/files/jixatowegidi.pdf
    • http://arkystudio.eu/userfiles/files/24724716721.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140fb2f708e4---vowutomurudabavobe.pdf
    • http://madiagranitosilano.it/userfiles/files/37815199962.pdf
    • http://kcpsystem.com/userData/board/file/12511718956.pdf
    • https://chiuman-hk.com/images/file/xaboxinofijaz.pdf
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/66854054641.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/ntl52mqghcapmohqimf9tpd297/67426921553.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e653b301a2---rulolukirus.pdf
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/3141903998.pdf
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/vazasosurufekimu.pdf
    • http://the-bom.kr/upfile/files/gexefokijuzitokepixebe.pdf
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/1909837376.pdf
    • http://eamenfaraz.com/cache/fck_files/file/55438214224.pdf
    • http://zl369.net/userfiles/file/1269810823.pdf
    • http://jjkxmy.com/upload/files/202109061048341464.pdf
    • http://officinedesign.it/userfiles/files/gepalejuvubonem.pdf
    • http://jaqalsports.com/files/file/40641158898.pdf
    • http://17njl.com/userfiles/files/30474648722.pdf
    • https://gres-k.cat/userfiles/file/60462711260.pdf
    • http://jinwoosmc.com/userfiles/file/80335377978.pdf
    • https://vroa.pl/chplusfiles/file/gozerapibuvediruvapivix.pdf
    • https://e-midas.ro/files/file/bulemomezirixaginisonono.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pm2+ecosystem+env
    • 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_off0000de1e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1E 16792 bytes
font_01_sfnt_off0000f635.bin
e40add1ab370d00b22ddfa5a176ecd555cf5a8302a5e48515321e19036fd8e7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 10292 bytes
font_02_sfnt_off00010d85.bin
603a82a228245e2788d022313f8fb8e0be8165de2107ae2f756974d2fe5d7526
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 18788 bytes