Malicious PDF — malware analysis report

Static analysis result for SHA-256 8755754513544bd5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 14:14:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f908fed4fb0998be30741dab298fcd6 SHA-1: 6d92a7c1f003d6c1ca0502a2e7b1dad4ca3e6ba1 SHA-256: 8755754513544bd531bbdebc749a4759cf7241bb216115d3d9b78b4c7de9cc79
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple websites, many of which appear to be compromised CMS uploads. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier strongly flagged this PDF as malicious, and ClamAV also detected it as Pdf.Phishing.Trojan. No scripts were extracted, but the overall structure suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://alamansyria.com/userfiles/file/dozujufaziwogigib.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160797fbcbc143---36972717573.pdf
    • http://irinaburmistrova.ru/files/mopijetuxovilo.pdf
    • https://olterus.com/contents//files/68991130327.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084635796bf3---42857009004.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/56532ce85922b2508f7dde6cd736ca18/jazepujuvuwasuzudabusa.pdf
    • https://aitalk.vn/upload/files/nuxufulifedoxu.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37b4e5b119---15951116635.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1e197841b6---99074957708.pdf
    • http://westtech1963.com/clients/d/d4/d4250bc21dcbbf02d7f9bc68df143add/File/8812171430.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608fdc81d1582---birejogodowig.pdf
    • http://konditsionery-reutov.ru/upload_picture/file/wanaxeredoluwejegaroxig.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095093f3d596---98960556679.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae751035ee---21912842559.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6d2c7c6fc---95329614623.pdf
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/f8e988345e0203e1d7e3859dcc96626e/ratugusezim.pdf
    • http://misterholidaysanprisco.it/userfiles/files/wigoma.pdf
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf10a827ef---budijuwezapejameg.pdf
    • http://teplospectr.ru/images/files/neganikutu.pdf
    • http://archgeo-leszno.pl/uploads/userfiles/files/luwawepozalejorabera.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607d41410765a---doxutinivifuk.pdf
    • http://labsshop.com/d/files/28590865398.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825be34278c---79081411584.pdf
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/78351556213.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+protected+to+word
    • 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_off0000dcec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEC 16792 bytes
font_01_sfnt_off0000f503.bin
bf963ce15c5aed11888481d46cc9d20d3b2c91aaabc1d0f1d089028401f2d230
pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 10128 bytes
font_02_sfnt_off00010bbf.bin
af59da7f7815e647ec4c7590406fbab28bfa186f7b94b08d9e7da29c10ab1633
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBF 17600 bytes