Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89e0bd7ecb5798e…

MALICIOUS

PDF

88.9 KB Created: 2021-06-25 17:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb1e9561c84110096084fe081d9ab21e SHA-1: b53379e9a6fcfd94a11f1daf95a1db5e476e994b SHA-256: a89e0bd7ecb5798eea3b3932180b92abca12d2bd9d4cccbdc3588dc8f3bfc23e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of multiple external URIs and a link farm indicates a strong likelihood of directing users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://resetimpianti.it/reset/public/file/56446653769.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16076297be92b1---86661818918.pdf
    • https://acryl-bg.com/userfiles/file/74856596005.pdf
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdf06e4a11---gafarufe.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ddfed4eaa---29090358704.pdf
    • http://comp-art.ru/userfiles/file/65625802692.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/576e126515796a7ac8e1711aa48f44d5/berazozodokoxesavo.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160794452e888b---rakafexopipudejowuzotanev.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3lmk6cv7ku05sgp7gorfcd9ja4/zetupemuxepi.pdf
    • http://alumcity.ru/userfiles/file/rawimo.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/a4e582cf4dfce8f892d6e6e4efba4f59/14677140658.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a84e3459e75---54921470306.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b84a0c60490---xapowurej.pdf
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/43e5d5f1e34a94124d229af20d4112e4/50039436954.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/18b1b1cb92af8ce7e7da813a917f976a/17911617406.pdf
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1df0615bce---98126184563.pdf
    • https://seeandhearbetter.ie/img/shop//contents/2587251143.pdf
    • http://ilturismoinitalia.it/userfiles/files/75988558005.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f067f2d85---ronarixobow.pdf
    • https://efficimm.fr/userfiles/files/furugosumelu.pdf
    • https://ekransamara.ru/files/63382955707.pdf
    • http://cephedanismani.com/images/pages/file/koxomaxupubifosuluvow.pdf
    • https://cjsc.se/ckfinder/userfiles/files/defakekejoni.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=technical+feasibility+example+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7cb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CB 16792 bytes
font_01_sfnt_off00010fe2.bin
8d3356e0432b493d696cb077a0c626fd676079874e6e9b06a81772052acbf5a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 10984 bytes
font_02_sfnt_off00012903.bin
3c1bde33ded97356dfed58967da48523e51167b75de7f23ba44c7ed2b16d6695
pdf-font-stream PDF embedded font (sfnt) at offset 0x12903 17316 bytes