Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d13e52b023c39c5…

MALICIOUS

PDF

89.0 KB Created: 2021-08-04 00:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 148e9163cd10619dd0bb7b8fc6c48543 SHA-1: 6bb0189f1e8db88a804b0559a358ba7ff6ac468a SHA-256: 9d13e52b023c39c5d71a27c5b3bd0c77d0b619472cb0650e04cdcba11cef51c5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating it likely exploits PDF vulnerabilities. It functions as a link farm, containing numerous URLs that point to compromised CMS upload storage and disposable hosting, potentially leading to malware downloads or phishing sites. The embedded URLs and link farm structure suggest an attempt to lure users into clicking malicious links, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=bloons+td+5+apk+download+android PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efedf71f66e---93807360771.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d2a69444---96979449256.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/juzotonuxuxagur.pdfIn PDF document text
    • https://bompentax.com/quangbasanpham/app/webroot/upload/image/files/99527353393.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/93l5ps57gi8h0qouu7b8p7mdpt/80819151169.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fac675e46d75386d56890b9a5135036f/nunagirugaxebukeponajigi.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o4gj8hbek5kvjcfq8nver7gjs0/8752658269.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/5268073775.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609eec576ca3f---kokodidateburikepinewixev.pdfIn PDF document text
    • http://cmtsport.com/pliki/45894282708.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210525003331.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/3rn3ev5sjcruoou782jkkftsh4/gubodi.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/bivuti.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/76892074063.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3c7b66124---6276407008.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/gu0q66lfajmf1sh2qmtekbpn8a/xavak.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e815a8f6d837f3a717634f3337fbaf24/xivobemewojabuxalusona.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/33476371570.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/6e58e79908d2c7b23edf62f86057bcf8/wawativoxibowowo.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/a09b261263fb7efd68720748398dafa7/xepafoseleb.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/25479502924.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/e3d5410ef013a0583fa06abd1b6b6c57/64115488089.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093def0c8dd9---39463814223.pdfIn PDF document text
    • 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_off0000f5cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CC 10620 bytes
SHA-256: c0ebfd203c48945e3d2e685c59e9de71e7fcf680876ed0e43479e430dca5bbd2
font_01_sfnt_off00010e4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4C 18932 bytes
SHA-256: 1b2b4531aa34ef4da3abde77f7edaad4f3b658198c12b446490da57794918718
font_02_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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