Malicious PDF — malware analysis report

Static analysis result for SHA-256 9af9713660743789…

MALICIOUS

PDF

90.4 KB Created: 2021-09-01 01:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5634a73d1b624f7f206f8d835708a7b5 SHA-1: 056cb4fed33150fec4062642e26419724f9aeb3e SHA-256: 9af9713660743789fc799d4cd768341418757ad0d8d158fa5784885731a1e8a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to distribute second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://synerhu.ru/uplcv?utm_term=wwe+2k19+game+download+for+pc+windows+10 PDF link annotation
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/c71bd43ca900ee4219d219e7d1dd4822/25772416185.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/46762470865f86922795140b7e987cb9/73453459499.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160895748ac2fe---zebimivajajukupo.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/ruzerevugabepu.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/56618699548.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/700afd5ce5cb0e36b1fd8af42a450f6b/gufab.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/mafadig.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/01dd669569144e576e88e305da015312/xefiru.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/e15f34ccd474c924c913f52a9daa0aec/30866664771.pdfIn PDF document text
    • http://belst.by/upload/file/pikokajivizuz.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6b552ce7ba0111f283007587fa28189e/wosenexizajaxonanulo.pdfIn PDF document text
    • https://jgranit.pl/userfiles/file/36785542410.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/zitutosufudegonepomo.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/40016172616.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c26672f17---33624831716.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xanasemu.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/jamedaximukapozu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58f2a6c2b9---tapavurodetupudoxepubufe.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/figalem.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1611411dea8433---86393375114.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/80a1459800325ff36262232e69fd0aee/963829997.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/82509bfe63392ede815c861c7f8fd063/91252867437.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/zazevidejunuwen.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/sabomilekeboroledopu.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F3 18444 bytes
SHA-256: 298d63ca353257186e416e97302d4c53f37f98b55fd047a77988dbf87c9273e0
font_01_sfnt_off00012869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12869 11496 bytes
SHA-256: 2cef3781007c1d59417c31f6f557ef1cf3abe6f424aee5ae9cde61f33fe99832
font_02_sfnt_off00014388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14388 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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