Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab3b89864719f5b9…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 17:03:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3345cd915358df8e268f099b13942ecb SHA-1: adff0483fa8aa681f20c42ca480bbbd1de35b3f2 SHA-256: ab3b89864719f5b9e432e1e21a1f217dcfce929798c6e6788a7098b7b44920d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document designed to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://interface-referencement.com/userfiles/file/22270610164.pdf
    • http://martonaroniskola.net/userfiles/file/44955774185.pdf
    • http://sampoernastrategic.com/uploads/image/files/98846338414.pdf
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/704b2b00f36c210cb1c776c52037cf68/84551092503.pdf
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9db069998---xanexubifugume.pdf
    • http://audiohrestomatiya.ru/content/file/fefoxisabufiroju.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/ee7b2c15410e900555dd0d7a3818cee3/82985994871.pdf
    • https://tp-pos.com/uploads/image/files/xariboxenevorelono.pdf
    • https://grandhotelbulgaria.com/userfiles/file/watub.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a6e991b6---49333071970.pdf
    • http://paoladebenedetti.eu/userfiles/files/67964611348.pdf
    • http://apexibd.com/uploads/fck_uploads/file/22679091918.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4c323f662---54094466607.pdf
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e43c22dbf9d---48221011750.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f75a5fadf---93834315721.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/aq9q0vttj3dhrq9ir7l83680vb/32886462130.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/1a901977874867212127d8e6e99f98dd/47146403690.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/dedizojetokiwiraz.pdf
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/68509576488.pdf
    • https://xn--interpeas-r6a.es/upload/files/nadaxixiziwelemetaluru.pdf
    • https://carrieres-pierre.com/userfiles/file/sadikoru.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f270b78b1a---852607033.pdf
    • http://vizugy.hu/uploads/files/tupitebuxasowe.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=cooperative+society+project+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_off0000dbb0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 16792 bytes
font_01_sfnt_off0000f3c7.bin
3bceca9a998cde47540e543d4dd3c4a0d806400d134e84638203f5d7bb9ab596
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C7 10804 bytes
font_02_sfnt_off00010cd3.bin
6f09fb9c1a9df7d44904d4002663c75f0e3e32276f6fa187eb7e9ae40d2c0702
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 17372 bytes