Malicious PDF — malware analysis report

Static analysis result for SHA-256 5104606956b70a7b…

MALICIOUS

PDF

83.3 KB Created: 2021-07-03 07:00:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e57e0edd307e00a141eac4aabc4f6c8c SHA-1: 4591ecf9a0053b2e665b051ca3ae1b6cc9252899 SHA-256: 5104606956b70a7bbc6821aa0a9b97544ef629f2e9720e4a460e4cb4694f5263
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to host or distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/ed71ba228366f52a7c4737b8e2c3a9b0/83092259985.pdf
    • http://dallaslandscapedesign.com/media/files/17542572618.pdf
    • http://nextgenship.net/upload/file/20210529162227485018.pdf
    • http://aliceinformaticasrl.com/user/pages/74641100473.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f25c2155a---60402236708.pdf
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/72336265118.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fc997618a---80463279811.pdf
    • http://uceng.net/_UploadFile/Images/file/wakukopu.pdf
    • http://bestbuyfromindia.com/userfiles/file/79793922494.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbc645007b---68445513826.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/0a7bd7e89cf675dd926b8789bbae221f/wenemikaze.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/e60721fa0f8771f1c4d715bb1252f09c/delowaguzadabitipikojelur.pdf
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7245699bc---fanaronapazefidilupoxog.pdf
    • http://ontsgoi.shop/uploads/files/2649597639.pdf
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/mumkgeskl725ruaeqrpuq2o7h2/fotokisagovokad.pdf
    • http://allprintusa.com/admin/images/file/80174273314.pdf
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/msb673bo6bj6ubveenhf4sf784/kewimasir.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd6a5f5ad---68894404980.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9cc5d3ee2f61dd51497692f464ba66a6/35542519413.pdf
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3584acaaf4a689af3fd01dd424a277c1/pibumubanotulowosat.pdf
    • http://ilovechardonnayhills.com/userimages/nenavodononubu.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160849ecf4e9d4---97435676424.pdf
    • http://jncs.kr/page_data/file/20210515152157.pdf
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/caac9cef7ea29463bf6b95732f2fcf25/zixewigudof.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=driving+tips+for+manual+cars
    • 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_off0000e165.bin
e2bb1b491b740cace6987f2516939984745e7ccf2b52ec385faf5ff54e21999b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 17500 bytes
font_01_sfnt_off00010f21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 16792 bytes
font_02_sfnt_off00012738.bin
c3d0db30c4743d4c981831a2b5e52c3e06e539ff2fbcfc6862dc326a8d513090
pdf-font-stream PDF embedded font (sfnt) at offset 0x12738 10860 bytes