Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcc9bf104a87a62e…

MALICIOUS

PDF

90.1 KB Created: 2021-07-19 20:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 926bc550c4effba0a75ef93f5fcd13a5 SHA-1: 9ebcf546a01f32c37ac0c0d05b68df48f5e64f4c SHA-256: bcc9bf104a87a62e7c9848913fca8cfd93d303f4a6db203a8017ab2ee7a00623
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to manipulate search engine results or direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://prospekt-rostov.ru/ckfinder/userfiles/files/4621967792.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b6bc8b1d8---62430875462.pdf
    • http://chothuexeninhbinh.net/data/dulieu/files/16060806227.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/77c558ab23d1fabca0101c216f3593a9/95125981103.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b71a967e6---kisigasurusefolizoduvu.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/fb5f5977f01cd79cdd8e9a7d2807b513/felixototowe.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607542c50e329---92305210972.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/e61c1771e2f8ff4d4e08a6b66b5216e5/linodiforolulasagogumasod.pdf
    • https://flardochform.se/userfiles/file/81181904760.pdf
    • https://pjkconstruction.ca/images/file/33936041405.pdf
    • http://kco.su/userfiles/file/68851071240.pdf
    • http://aliglobshop.com/userfiles/file/xuxisewijogabuwizadazov.pdf
    • http://perfekttorun.pl/pliki/30941082694.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838168bed2c---sedumoxajosovuk.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d1da64a45---pimamikukubitobojuvaber.pdf
    • http://archerelectricsupply.com/userfiles/file/sofokelini.pdf
    • http://ersatzmonitor.de/userfiles/file/28540238963.pdf
    • http://rayanchem.com/d/files/sotebefosuwobino.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ec9bcffc016b43f4980b3d1968e48b3e/kixagijagikokisofaziruj.pdf
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/zejawuderekukomezatubik.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea4d2a1b13---jinafonijoseditovuf.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/2134885654.pdf
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/102a176019cdbf230a564e69c8386d16/25853449054.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/ocp4h0b8ejblonngkt18ghqssp/57670156421.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=alan+monroe%27s+motivated+sequence
    • 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_off0000fbad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBAD 16792 bytes
font_01_sfnt_off000113bf.bin
a1d8f029f799912987f3739541c981b2af1762b5c51cd47df034cd06046dec6b
pdf-font-stream PDF embedded font (sfnt) at offset 0x113BF 17288 bytes
font_02_sfnt_off000140b1.bin
e711fe28f5efe4a90745115ca9ea91b52ac3b2ce5a050f2a4c97f5072d793c5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x140B1 10856 bytes