Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f54550bd6de138…

MALICIOUS

PDF

93.9 KB Created: 2021-07-19 18:48:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f0b7b7696bf98991481b7e78aca41acc SHA-1: 5b3824893d479dc95dba161dd839418546d92232 SHA-256: 86f54550bd6de1387c692527381b4bf74cc518bc0b8ee7898d998ef9091f1829
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, facilitating redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ee51d3c9b6f---vanozotusode.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/15299034862.pdf
    • http://maychamsocda.vn/images/userfiles/file/60414101144.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e73ea619b---85884950566.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b47e9f1b187---kazojewo.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8024ca9dc6---27197242630.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/9fa158cb3cee27eadc34479c194c4d28/29690251374.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080d71c25860---45213371958.pdf
    • https://peilimineko.com/userfiles/file/rovufexilovaxi.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/wusatojelar.pdf
    • http://cuacuongiare.vn/upload/files/57247906878.pdf
    • https://nestsearch.in/admin/uploads/file/87103351390.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a1724f2a6e1---69875512901.pdf
    • http://hopkinshigh1961.com/clients/878968/File/91738142842.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2db6a8a56ffa0dc1e7dea22a747f809d/xenidibezon.pdf
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/70a0eade9b34d8ec7fe44f161909221c/56569512896.pdf
    • http://biomassasia.net/data_ed/userfiles/file/mulutu.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/ae2d837f9e727ed027684653caf6a921/7112445612.pdf
    • http://abaj.cz/UserFiles/File/88718052568.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d7eb5e64---17806737059.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vf96nhlqlfubbb1ctnsvt2ast3/tazitefipufosunafiletid.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/4127bcec62659a3af077043d59b26599/38391219821.pdf
    • https://finatwork.com/userfiles/file/rorewagudusuze.pdf
    • http://teknis.it/userfiles/files/birowoxad.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=timothy+hutton+and+natalie+portman
    • 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_off00010caa.bin
44545cbc26f700b607a775d0d4a37e5660c1fd593f8be4786a86973be6c8e041
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAA 10664 bytes
font_01_sfnt_off000124e5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x124E5 16792 bytes
font_02_sfnt_off00013cf7.bin
086d89020a60584196a83c84d2f4d1d3acef1a9517f3cd207ec0d0507e37e003
pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF7 17468 bytes