Malicious PDF — malware analysis report

Static analysis result for SHA-256 28924c2489dc9b2f…

MALICIOUS

PDF

87.5 KB Created: 2021-06-27 12:55:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7cc3b022199bf9482dca05e450e23aec SHA-1: c294b4684fd443a01bad9d6340b18b1e7372dc15 SHA-256: 28924c2489dc9b2fa3ad1358d8afca7b2c46befa394c3c23e79238444dc0c165
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm hosted on compromised WordPress sites, suggesting a phishing or redirection attempt. No scripts were extracted, but the presence of multiple suspicious URLs points to a likely phishing campaign.

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 http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/6030556729.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b22a8b57e0c---71392666111.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0e18ffe6cea615faf4f4c7bf0cc63b31/rekokezarojirudube.pdf
    • https://accuratesearch.com/userfiles/file/50925741303.pdf
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/20320947112.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/b131e966c59a09a39853a5599e8f94ef/walutawazufidadune.pdf
    • https://ferest.ro/imagini_ws/nufevixigilimumatarowoj.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/3e3015b6f27d7a9210f0818d5ea435c8/79941570934.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/34a4e3247fdaf3669ed272c0dbcdb639/73787811774.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/8ks477nb6rnkd7q47dmv2e08vv/segavopelametosegevet.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ce4a7bf84---40422160652.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3knrlhmufs6tnh8cpf8j2fe46c/tumobepawu.pdf
    • https://ptogel2.com/contents//files/7497321119.pdf
    • http://donghozibistore.com/luutru/files/mapurivewoviwivevotaferox.pdf
    • http://www.anclupnapoli.it/userfiles/file/kaxadoxudetimosenowenu.pdf
    • http://sladkiy-ostrov.ru/userfiles/files/foxawizefuzoxam.pdf
    • https://www.analfissur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072893dc70db---98113378552.pdf
    • http://sicompk.com/survey/userfiles/files/18711441522.pdf
    • http://whsclass1968.com/clients/f/f8/f849445bb2fb8f42e7c863050dc1ba38/File/mavakowodal.pdf
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/52iqc9hbeqauaguc49sotgijr6/33655545908.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/e0dcrf7ub65jbkuhn21f5jq4k4/23639846010.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/o1c1hdmcblbnp267h8fi1ttuj7/raxokazozakarekunag.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe6079a584---viluribetemopozosuf.pdf
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3250128de1---16743911260.pdf
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/d8ba60c8746ed70aadbe2d6f440589c3/9010008450.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=meaning+of+resource
    • 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_off0000f3c9.bin
6ab025a153cd542c20c05c2da4aa8e7f9e6c913a7e642efeceda3ea71d6cdd7e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 10460 bytes
font_01_sfnt_off00010baa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAA 16792 bytes
font_02_sfnt_off000123bc.bin
7adf1327ea6609ad581620987050f2072a5823b365d66ad7f2d7817872bbd0ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x123BC 17208 bytes