Malicious PDF — malware analysis report

Static analysis result for SHA-256 2672d155e3acb977…

MALICIOUS

PDF

78.4 KB Created: 2021-09-03 07:03:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6cc4457dd5b663ee1381e651d2aa0c12 SHA-1: e96b425d76aae94d44b01e0afceed177806b883d SHA-256: 2672d155e3acb97726ea8b354be17d6aac8b5f31859fe0ddcd9b34e21bb479cb
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload plugin directories, suggesting a link farm for distributing malicious files. Heuristics indicate these links are part of a link farm on disposable hosting, and ClamAV detection confirms its malicious nature as a phishing trojan. The primary attack pattern involves luring users to these compromised sites to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7e1b10a65---bomumatiwovirokutu.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/amsmlijkpa7opg177dijo5e9pm/94710485210.pdfIn PDF document text
    • https://vinacomvietnam.vn/uploads/news_file/diliziva.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e3f2b9a0e13f9cd7e80edf18683befab/wutorediw.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/tenumozafatemewor.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/0eaeceee093d275ec7e0dc640ee6c5ee/13336595510.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607586960ff2f---45623985857.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612b1f4ce9fc9---36897630007.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608268b7336ec---giwawo.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/lobivuwuvikek.pdfIn PDF document text
    • http://kaies.cn/upfiles/2107281227255805721m5b5t.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/nafilupoturovogikub.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16088293408d2f---63522576403.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/7996601823.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb88d0dc73---titasoxosivojigosig.pdfIn PDF document text
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/jawawumojikidat.pdfIn PDF document text
    • http://www.toptehnik.si/images/kugunadiravilav.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/gametitemotawidetaxeko.pdfIn PDF document text
    • http://tulga.ru/editor/files/21646170350.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/bd89fd8ec86c86b8beb4877889b96607/85691725716.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/b4ci1o49476musirvvrnkgqg71/43252008379.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/361e2db6704724abebf9e60d33097bbe/23949876082.pdfIn PDF document text
    • https://mollis.rs//files/xotosofogab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+download+marathi+books+in+pdf+formatPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC481 11060 bytes
SHA-256: 35a68ab13d05c30c26dd5df6e715fcd9c2cb98f9b1e14339d8bf9f9b4a43bc73
font_01_sfnt_off0000ddd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD2 20280 bytes
SHA-256: 400cbaea9575757b99f16b0f3a72f3f54ac16604ba41fbe0a8a5edf90bb4ec03
font_02_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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