Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffdc6e03a8b77cf1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-25 09:24:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 94b1e0bbb2db93511a1c389fabceb26b SHA-1: 7ef7e1eb3ba1c355fe89c413162086980b68ab41 SHA-256: ffdc6e03a8b77cf16b7208be06e130623bb188ae6ad5f7b9bc77c789baf3705d
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. These URLs are likely intended to host phishing pages or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=while+my+guitar+gently+weeps+ukulele+tab+pdf PDF link annotation
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bvvpp91opnjh0qqkbk40fo58g4/44781413296.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16141ed9a74e68---doxoresuzawujukanikulot.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/42751779058.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/zowixiletedid.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202193949338154.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-24/20210924212707803564.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/bomixejiwujoxal.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/telawebifub.pdfIn PDF document text
    • http://atrsara.ir/resource/files/rofokudirivisa.pdfIn PDF document text
    • https://thepainter.asia/upload/files/41245343982.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/12403298967.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446ea5e4ec5---petufutufo.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/rejekuwum.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/19760038852.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/mogaziput.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/famopututifoxu.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/75787048712.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/rokiwozarufetipoza.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/rekelikifevo.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16143647610e3d---50380245308.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/bikadogubewa.pdfIn PDF document text
    • https://fptica.ru/images/file/55840683909.pdfIn PDF document text
    • https://listocrm.com/userfiles/files/89118563650.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/49472689931.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9c46cc348---kadikibej.pdfIn PDF document text
    • 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_off0000cc38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 11352 bytes
SHA-256: 08c48cf81635fb479cdf5c4d1723bfcf14e6db980c4056667dce18e8f93c1e39
font_01_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE72 22536 bytes
SHA-256: 22a6009a9a278576744fcfc467831cfe7de28dad3a1c446723e4467e88c9f125

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