Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c7fa87a6532bc4…

MALICIOUS

PDF

91.6 KB Created: 2021-07-17 17:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 856ba4aa053de8b91f246cb335c6dce8 SHA-1: 922ffc35d4f956613a812fcddfd6cd238c2682b6 SHA-256: d3c7fa87a6532bc46c02d4dcddadd65b3b2e08710d51d6fecb17bae9afd0b77e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and embedded links suggest it functions as a link farm to lure victims to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/52939e7a69b1972064c5583ecb60b4ae/bugozinalanal.pdf
    • http://humanitool.ru/userfiles/file/16415148836.pdf
    • https://egyptsuntours.com/userfiles/files/dejedagel.pdf
    • http://komputerzagrosze.pl/userfiles/file/4383413415.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160853ea5f1598---zozerixop.pdf
    • https://stayatrosetta.com/wp-content/plugins/super-forms/uploads/php/files/7f2vbsijcqnrbjhm38df3vdvd8/valuzujudefa.pdf
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb82552441---guvak.pdf
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/vke2m78crpsriog8kclutf8gfr/39086439071.pdf
    • http://pivotal-technologies.com/userfiles/file/rupuzoviz.pdf
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f09bc67425---5891071718.pdf
    • https://dallaslandscapedesign.com/media/files/vibekogemudigiz.pdf
    • http://ed-web.cz/userfilesfile/27552009520.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a931db6020---55046502936.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/6f40d2ded26398c861dbbb7b194bc12c/fabukuwufitobejezarez.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088216ad13d6---93946410303.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3ba60196168b518dfb3782cdea461779/59010123387.pdf
    • http://getem.plfiles/file/12210542683.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf953244a8---94463527503.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/7b146e4678521fa1a5d905170ab78bc1/pusojasuvifolozudituxuzen.pdf
    • http://jmdfhjl.com/fckeditor/userimages/file/fimavajudenigodokoraleput.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2a6221e136dc0c10b975e945bea8f88b/37193189692.pdf
    • https://argumentua.com/i/file/xinixa.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607864c1d95c0---47399617023.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+12+degrees+in+celsius
    • 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_off000101d3.bin
f895b8dd1cf1ff55637deae21f755b46d1206bfb7a0d3ef8dcd2c3fa7b17a3ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 10796 bytes
font_01_sfnt_off00011a88.bin
e5e5e40ffdd39426995fad9206a64b07817c4b963cc8fbe2257afc870c612939
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A88 18100 bytes
font_02_sfnt_off00014902.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14902 16792 bytes