Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc76714d03d2f57…

MALICIOUS

PDF

98.2 KB Created: 2021-09-19 15:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 60e9875007d622613097a3c17b0cab91 SHA-1: c6c38ff3a7470f514ba1205b41b693039ee9a83c SHA-256: cfc76714d03d2f57b65b08d74569020e3cd9df71db382ebcbee3c9a72bdf8b79
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of external URIs and link farm characteristics suggests an intent to redirect users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=watch+mulan+2020+online+streaming PDF link annotation
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614356bfe80a6---tetuwivuluzuvofukaxewo.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/fikamips1q1sr285gloihjk193/rujiruxoluzaf.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/76943012406.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/26687991037.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/52632659862.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b90b1c1e3---ropukilonexaxikate.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/xefopovuwalivebixajuwibu.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/55249569716.pdfIn PDF document text
    • http://master-stroi76.ru/userfiles/file/gepivejek.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/duzedoluzoxozonilibit.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ul1bsraieiupthjgn1ffbcg3k7/79865293608.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/futew.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/39295013622.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347cb65ef49---95542341037.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86012bf2e---18010420029.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/50645258173.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/xapobamu.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/jazixodive.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/80237816895.pdfIn PDF document text
    • https://dom4m.lv/userfiles/files/60696241102.pdfIn PDF document text
    • https://sapthagireesyathra.com/userfiles/file/83443965144.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210902215118_gjjkp7.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/75258039805.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/31648738287.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/27977941940.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_off00011a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A09 11012 bytes
SHA-256: c1c644b2818b534ec053113ff24bdba993322356d50a08101f1282f06d5cebcd
font_01_sfnt_off00013384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13384 18548 bytes
SHA-256: 361b1d13c6f4f1d87db0554bee36664d7dbd59635ab0ba7ba21b0b0b3a074a10
font_02_sfnt_off00016400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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