Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3d3f1c54a32c132…

MALICIOUS

PDF

179.9 KB Created: 2021-07-02 15:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 46efbd8fca1bfcf40a839026af201529 SHA-1: fb66c5032bdfedde64fd96a42c556f8175340b2a SHA-256: a3d3f1c54a32c132ea8d3709d32acfa83bc65600bec6e7f72979402547c8a560
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 WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farms points towards a tactic of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://queure.ru/uplcv?utm_term=sexiest+weather+reporter+in+the+world PDF link annotation
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160912779ad21d---vojegilog.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/v0tv9mgisms98c6almdrlgvnh3/76782126352.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/eba925d3d673f10ef34f4d9a45e0fdd4/bakametarejavadisema.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/bixolofoj.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5e1835820---lawutiwu.pdfIn PDF document text
    • http://artepcb.com/upload/files/sawetet.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/34537736897.pdfIn PDF document text
    • http://janatalnajaf.com/basefile/janatalnajafcom/files/45769285322.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66c0c03bc---7183147743.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/abb1fda2c3884bf69499e420fa8673e5/4733635193.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/dobijaxes.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3f400a3eef9272645ac4a3d4d4b37da7/gipobirerotejavoze.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/89c70bb1c0565094360d2d756194de9f/sexuligosu.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16093bf3a39a19---kosaradumaxam.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/2ad6dbe2871c013d3ebdecabf4ebb8ff/ribizekivawolevokare.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/8o80760l5igolcnalarfsatb16/gifofewunewojineg.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ja3l47j2j4dig803bkd94j8pu1/51871123981.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/bukimedavaluwo.pdfIn PDF document text
    • http://accronline.com/userfiles/file/35588257736.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f9klkf2eme52gvkmpp0me8ncvi/58130961349.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/94f2d2cf0c1240a7e1fa9883c04ab358/46928044498.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b07f9741d7---10457701504.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_off00025d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25D03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0002751a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2751A 10752 bytes
SHA-256: 650ec1a6cbe888e2a6eee2879f16da953c95b887476b7001a152a7d9ce72c4a2
font_02_sfnt_off00028dce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28DCE 21280 bytes
SHA-256: 66b5529f48c8ef7c2f8ab4de0bd70499c4f61f1cbf1fdde3c317b98d008a9db5

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