Malicious PDF — malware analysis report

Static analysis result for SHA-256 7728b813ef5916f2…

MALICIOUS

PDF

90.3 KB Created: 2021-08-07 02:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d27a1394f75c18d67c72148dd81a1811 SHA-1: 3458ac5271b54951b94698ca224076773dc1ffd3 SHA-256: 7728b813ef5916f2d45c33726b8a613e64d8e2d18039c66282b3c07d257df3e5
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to external resources, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links to potentially malicious PDFs on compromised sites suggests a coordinated effort to lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/q0mlsei5q63e444qk8euv7vbdb/xijuwakijos.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9ac6e1d2a93068a8b8a1cde6ae11413a/95759215805.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd89e489c9b---99170086355.pdf
    • http://mmckno2010.zkosuchdol.info/files/toketegezenifa.pdf
    • http://investbuild.ru/var/upload/file/70384137746.pdf
    • https://iskoruma.com/upload/ckfinder/files/xikixaxekizo.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f96d196c6---73505828916.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/11e113a37fd1c577b09e9c9147b2f931/jikeselogafidibuted.pdf
    • http://cesmclassof68cheyennewy.com/clients/82478/File/91157673313.pdf
    • https://securitydm.rs/slicice/file/boxob.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f99dcd39b4d---68211219760.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaba713a337---70097366849.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6pht3lkk904m24jpgnv313b332/45134170710.pdf
    • http://christopherdallo.com/file/mikefaberuwinajefilidef.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160730d19ab3c8---zemuzux.pdf
    • http://4seasonstours.in/userfiles/file/65780516597.pdf
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/66286664462.pdf
    • http://qazaqbanki.kz/data/content/files/39531671027.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/c80f8e08b8a8dd909468667d0b2af2cd/nikij.pdf
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/6673c3c77887dce02fe64f616ebb87da/48467582401.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867649ba1a3---99865405219.pdf
    • https://bdblue.com/ckfinder/userfiles/files/zoxisak.pdf
    • http://studiomilano.eu/userfiles/files/vosubotinakajovabetax.pdf
    • https://nisahanpin.com/calisma2/files/uploads/vinivulexos.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/2ekl8pkihbjkdu4gv0dqv9s7ec/24335242838.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=corel+draw+x5+crack+version+download
    • 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_off0000f919.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 16792 bytes
font_01_sfnt_off00011130.bin
6e870738eb406f7e691437f679ca2deb463444d30453044a2600e244697004a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 10776 bytes
font_02_sfnt_off00012a3a.bin
938c78cf10ef32a7811c2323e14e288db532fa2329755165b69863853b38ef64
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 18980 bytes