Malicious PDF — malware analysis report

Static analysis result for SHA-256 331e2e62522e803f…

MALICIOUS

PDF

86.5 KB Created: 2021-08-07 23:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f184cbe10f1493b01c97b05eeb30f895 SHA-1: 22f72bb0514c360c94c52689270fd0ff0aff22fd SHA-256: 331e2e62522e803f5050cd49a19a84fc654f835f1bcacf5c088d597dd95ac9f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing lure, indicated by multiple heuristics flagging it as a link farm pointing to compromised web hosting. The presence of numerous URLs, many hosted on WordPress installations, suggests an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://allytemp.ru/uplcv?utm_term=roles+de+grupos PDF link annotation
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a26c29ebf2e---29243124109.pdfIn PDF document text
    • http://vanphongphamhienluong.com/upload/files/7002648962.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1bb3ea913a1050cd1d996ae628773ac7/busemeriwusoginitoxe.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9e782a4f---rorojuvobonirogogegulix.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baad6945a63---76830306739.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/66730704051.pdfIn PDF document text
    • http://icwest78.com/clients/67591/File/puxebilinitigunev.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/6555652460.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2f313f40---94452298695.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/d401021f9da2499d7feb70797ec2f3e9/gijunotideja.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/paliwuxufatiman.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/kadimaturubesedakarij.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b8162f7eb---17959549673.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/c062adfb4010408a342dadc5ead1e369/24895102100.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/tidolafuxoromisukubulu.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607018cdd8d16---biwitakexijedadegamuw.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/57170080400.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/tasubufabubezoj.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db0057c587---tukiwabum.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/sotevejafowozefaba.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_off0000ed45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED45 18060 bytes
SHA-256: 3426bb1bb08ecead6f2e26735f6c49527ff28dc4e56b685a5d8e7989e4d0a3b1
font_01_sfnt_off00011ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B8 10256 bytes
SHA-256: f1adc8f04157e2c23da51bef2c3af162b974b8684697624a554ae8fce0082fd1

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