Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9fc3c9a07b8264c…

MALICIOUS

PDF

79.7 KB Created: 2021-07-04 05:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 96415c5d4df76f5a098d0261c94b2c6b SHA-1: 3da69110575d22e112c1b4473e35a4a7435f2785 SHA-256: b9fc3c9a07b8264ce0dcb780578e3beb2cc32d629af9b81b9162afe2598cd6f8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics identified the PDF as a link farm hosted on compromised WordPress sites, pointing to potentially malicious or phishing URLs. The presence of numerous links on disposable or compromised hosting suggests an attempt to distribute malware or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b697fd3e1d08c264118df0427e9792b0/1670222440.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/u8e5ldiincltuob941j6cla5vi/somaxinitijilovulo.pdf
    • https://jotekonybakterium.hu/userfiles/files/51750149624.pdf
    • http://brandnewgoods.net/userfiles/file/dadanesotebise.pdf
    • http://jocoseatee.com/userfiles/files/xetasujut.pdf
    • http://syuncyoku.jp/upload/file/zifedinazamogivutules.pdf
    • http://hzjksj.com/images/upload/File/dowejab.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d686a1dd6---30530704969.pdf
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7d60bf422---dawuwagininukon.pdf
    • http://nemdanangpho.com/uploads/2021-05-30/images/files/97205021524.pdf
    • https://mimpi1pusat.com/contents//files/nofotok.pdf
    • http://stonebreaker.at/91624592214.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2edf7c7671271d9de2b9bbfe7154f6ee/85889953602.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a24b2a8579c---24193990413.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a75c563eb9e44d20c5719def4857e9ce/kuvurevemuko.pdf
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/dodinidazari.pdf
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/3ac52dbc57d67ea376b2ecaac9f2abda/28123443074.pdf
    • https://langumeistras.lt/i/File/95578545790.pdf
    • http://alacarte-design.de/userfiles/file/48798683337.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c97b40a1af5---delox.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+briars+newcastle
    • 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_off0000d3d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D9 16792 bytes
font_01_sfnt_off0000ebf0.bin
6f0e698d26563f6a0eedd29dbe8b4c845c4a1b58cebcb17673d52ede54993f80
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF0 10396 bytes
font_02_sfnt_off00010377.bin
cb25a32f7a2f86ab884796a3828f5c353ce4fd69aaff4d88aa4565b87ead0fc4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 18580 bytes