Malicious PDF — malware analysis report

Static analysis result for SHA-256 f82d68ef12e4af40…

MALICIOUS

PDF

73.0 KB Created: 2021-09-21 07:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b10ef33492b16e3066fe9493b7a32941 SHA-1: d6de05ee46512e820c9ed14824e5c01b83727857 SHA-256: f82d68ef12e4af4021c3ce01e13ee2761b932c2845bba4fe930affead676b460
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 PDF structure and embedded URLs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://coretry.ru/uplcv?utm_term=best+free+music+download+apps+for+android+phones
    • http://d-innovation.com/upload/files/52613074862.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368712b9b0e---sogunitazu.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcf6b2b6d---venesoropavoxasedomi.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426d38db987---59198646925.pdf
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/e28739b9bc05a34a0cefde1ea9a571a0/fojum.pdf
    • http://hondatayho.vn/images/ckeditor/files/fazuzuf.pdf
    • http://anpharma.net/upload/files/jobotetazezukupukamugabiz.pdf
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/buluzaraxabinikifisezizex.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/6f23b6ab8287c723e0b57082f90101a2/46289037054.pdf
    • http://jagdrevier.hu/upload/images/file/36939317946.pdf
    • http://lovesenergy.nl/file/11534406242.pdf
    • http://traktorpulling.de/ablage/userfiles/files/vozasamikagepakezig.pdf
    • http://thuduchouse.vn/pics/file/mimawax.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132e215434c7---92520476295.pdf
    • http://dytac.hk/userfiles/47737452995.pdf
    • https://nergizleryapi.com/image/files/wawemuj.pdf
    • http://oasis-inwaste.asia/files/file/48003849738.pdf
    • http://aligokdemir.com/resimler/files/1128072640.pdf
    • http://zzzwchem.com/upload/files/78114682101.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/26342534352.pdf
    • http://obchodsezlatem.cz/upload/files/19527468825.pdf
    • http://ijfbn.com/editor_up/nopepoxude.pdf
    • http://xinghui.co/upload/ckimg/files/202109060714147176.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_off0000b9f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F0 16792 bytes
font_01_sfnt_off0000d202.bin
a3daceabc00e49b99ef309b261540eff562765dda387db336a7d135e27f3c797
pdf-font-stream PDF embedded font (sfnt) at offset 0xD202 16472 bytes
font_02_sfnt_off0000fbff.bin
49564d41bef8e0ea2180cc201180fa5f2159d8369b997f7185fe5c3576aa027f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFF 11124 bytes