Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf62270ab6455f2b…

MALICIOUS

PDF

115.5 KB Created: 2021-06-26 00:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b2bb07d4af544f71afe9e52153c1fd17 SHA-1: 919c752762586b85bb53b0698a78b9ee568a84f9 SHA-256: bf62270ab6455f2b3de352ac4790578263467966340f0b00fadd37fd1b876f67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The structure suggests a link farm designed to leverage compromised infrastructure for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f682e260fa---73827118784.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/38827104965.pdf
    • http://fanti-fitness.pl/uploads/assets/file/vunifipigubaripi.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9c20c234---89109667592.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/f0ec0cb703202d531ed7f60c4ac8b7f7/35009708880.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0be02ce1c---ketarovirapaxolisase.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/sclneab2e2hul2fijaen7rhn7s/57258657978.pdf
    • http://quickvideo.nl/userfiles/file/11416463588.pdf
    • http://austral-immo.com/userfiles/files/judirofajanazidodazimepev.pdf
    • https://epiphanych.com/images/file/16119575250.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//40642896142.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/6fe4c54d3b437e6b3d0e3b2908e8652c/dufoz.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7244a532c---5238785635.pdf
    • https://zlatartopalovic.rs//files/41750570832.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097aaf5680cd---kemikulonev.pdf
    • https://ahreco.com/uploads/news_file/pifevivaserodasewifaxoti.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/0591122405dce43d904698be4dcbd853/jirew.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0656b87053---loniwemanorokurawazuweki.pdf
    • http://meble-tk.pl/userfiles/file/nofixukotino.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/6afepeiov02r1vs9j1apfbsnv3/lanasijanogibumadi.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1db50c971---85893981692.pdf
    • http://sciattella.net/images/file/gemuvomufidasatefidaloluj.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=40k+planet+map
    • 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_off00016714.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x16714 16792 bytes
font_01_sfnt_off00017f2b.bin
0cf3ec6c8a6aae64a1a69373d4b6a36711d8b3f81020ccfecda289c466cf4e55
pdf-font-stream PDF embedded font (sfnt) at offset 0x17F2B 10128 bytes
font_02_sfnt_off000195c3.bin
c7d0fba539e30f9808de1db0d0ee03ea811d294594ff569d1d0370d7a75130a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x195C3 16740 bytes