Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6804130c8d15c58…

MALICIOUS

PDF

91.4 KB Created: 2021-09-04 07:42:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 271da0d5d5652c31c145674c98cf9193 SHA-1: 4f37f09c475f56414e1bda7ab0064930939706ca SHA-256: c6804130c8d15c584f42b7e0a2466f49bd0e4e45027f89145b84da2cc8ec229c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ilyxrace.com/userfiles/files/lekozona.pdf In PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3h7rnoq3cn5ihsksqf00gtk2k7/vabiremifez.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fbf2dc530a---94986188171.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/37917222379.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/32441344136.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/xokowiwovazabokevigafitaj.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/74339174811.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/sbmnmhf9j7fm120usus0uk3ig2/94244810877.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf72444e88---fenexavijuz.pdfIn PDF document text
    • http://cedarvalekansas.com/clients/875954/File/54233999823.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/29640207061.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/visitabomuv.pdfIn PDF document text
    • http://www.heksan.com.pl/file/xogatada.pdfIn PDF document text
    • http://preiswerte-unterkunft-papenburg.de/mediapool/biduxazoxode.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/67118179755.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/f226fab065b9a4d256ec8a58bfe46030/patogudebe.pdfIn PDF document text
    • http://camera68gialai.com/uplaod/quangtri/files/27976611924.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846cb1f1e6b---16529707096.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0c756af5a0---nefus.pdfIn PDF document text
    • https://raljob.com/userfiles/file/lusixekilixedoded.pdfIn PDF document text
    • http://webbuilders.com/files/file/puviwekaretakapabeg.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/61205267499.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/zeramimu.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mizakiwenofarivax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=zeroth+laws+of+thermodynamics+pdfPDF 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_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 11048 bytes
SHA-256: b527995aa4f5a1cb2968e4a8f920d03f727256c18ad19fba227b2e5d74c34751
font_01_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5F 19840 bytes
SHA-256: a8bb9a1799b85e09654f8100a8a2a5684d01a6884a94121376f952260d002610

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