Malicious PDF — malware analysis report

Static analysis result for SHA-256 23eba246813bb1a4…

MALICIOUS

PDF

87.3 KB Created: 2021-07-01 22:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b082467feba73af8f18b0e0832c23802 SHA-1: 3ab74a813d95d6a94d88165bb5cbb90851268550 SHA-256: 23eba246813bb1a484bc6b8ba0bb3f469920b6a2c4d3e119b412a6a109e5ab0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users. No scripts were extracted, but the heuristic firings and URL analysis point to a phishing or malware distribution 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://caopump.com/admin/userfiles/file/pijap.pdf
    • https://brod-plovdiv.com/images/pedomikodaxupavaju.pdf
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/m1oi0rui0cqobr8ithk0upsbie/80876348716.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f803b3879f---wuzopivesar.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d0b80d0db---fetejetofadenu.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d2fc7490f---jexaxufirefonozimexigu.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609408b424cd0---23335386721.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c8bc3ec14---83402434436.pdf
    • http://infinity-pro.ru/userfiles/file/98634121058.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/eaqdhdl6jvts2khjc87fgo5ner/38752462902.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2422566f3f---girokumutotuvamu.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44f003ac8---siwerofexoted.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/sqkm61tmg5eqr1bkni9200avbo/39124993336.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075cdb329e49---92370349629.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce321b43c8---lotoseboxerosisurinam.pdf
    • https://wietsevoermans.nl/ckfinder/userfiles/files/jumatoku.pdf
    • http://legalinet.eu/userfiles/files/74331745914.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608798f78c76e---nevureze.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733f7bdbb5a---9988865379.pdf
    • https://arab-hams.com/Ups/files/rupemuwedunoganivoxaz.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ruqta6262q0a4tiut6chqn3co4/67406210745.pdf
    • http://atol-res.pl/uploads/file/devozunirixozogavenaruled.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160939f9c1319b---sipisakadepebukilezuvaw.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/9242ae3db080429b2a4b0bf7f6f5e391/xakuzebizadeguta.pdf
    • http://shosholoza.de/file/rusidikusigapa.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=best+english+poems+for+kids
    • 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_off0000f27f.bin
bd6aa48c39decc540e378f0fd9489f171406c256363f183629d760eb2bf4d85e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 10928 bytes
font_01_sfnt_off00010b5a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 16792 bytes
font_02_sfnt_off0001236c.bin
cf337cd30edc046f4fe0594b1059e6c903a7fb83c25a0e5a3c0200bf13486f9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 17124 bytes

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