Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55bbc0dcc25dea1…

MALICIOUS

PDF

93.4 KB Created: 2021-07-01 10:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7032c7a3bfe48d7a466dee59ded1365b SHA-1: fe0a6b1a5918744dd858ff6e68327ca9e38bcf5a SHA-256: a55bbc0dcc25dea1edb018229a2b92a65c778206a8812c1eb850b6dda0326ce4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as a distribution point for further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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 http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072c13366323---76781127824.pdf In PDF document text
    • https://ikansambel.com/contents//files/28221039417.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609857a3e5703---taluwozetazudaxabe.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d08168e908---59005146567.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/58564876435.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/73047882580.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/d3cbb530f07e42c8ec08dfcc985273a8/85954828001.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/dixajiredalibolatel.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/v1ujmu8k80dq7s79sm0ktr4nn7/lelufazexelepaxo.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607614355e3d0---jujinevujalidefefipesufav.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/6eb7ac992c7eab80a1526bf941cd53e2/katakatojenutigovefub.pdfIn PDF document text
    • http://salkim.com/userfiles/file/movotikijafexiwutev.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/nafeso.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/07fb012a5ad032fc321864f0b02a3fd0/webelotiwagutalojibewigut.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad6542bac0---28866446169.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/81256622921.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b4e3df1da---xusudenopozoxadilosu.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078868faff97---tajonuvuvijo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b73ec698ea5039da07ad1e1ceeb81a2e/15607966881.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/943fbf0ffb93ed549d4862d406eff8ea/91726972060.pdfIn PDF document text
    • http://wohingltd.com/userfiles/27340089296.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/91810337863.pdfIn PDF document text
    • https://vestol.bg/files/file/bikusilum.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5703653c60---77369613277.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/5333217235.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=usps+canada+postagePDF 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_off00010b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9A 17252 bytes
SHA-256: 75ee109f4bc3a6e88d3dd484e79f94b3c9c2de55a0b19cb9f5ea04daf6d65279
font_01_sfnt_off000138ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AE 10456 bytes
SHA-256: 84350f2aa9d10aa86321e8b34791d99bb7fa841fe6fcedfbbbd9d9f8927b2fd4
font_02_sfnt_off00015066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15066 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1