Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a41644298c1ec6…

MALICIOUS

PDF

86.6 KB Created: 2021-09-05 09:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f52e2e34a6966bd3d9eb886435e817fa SHA-1: fdea898e73e9bc20ac0f6b7b7b022c0d550877c8 SHA-256: 74a41644298c1ec677e6a18dfb6a51ce1861e0fa9bef8fa02cb78013f2b3de3d
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of links, many of which point to compromised WordPress sites and disposable hosting, indicating it functions as a link farm. The primary purpose appears to be directing users to potentially malicious or phishing content hosted on these external sites.

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 http://izumrud38.com/ckfinder/userfiles/files/19782871706.pdf In PDF document text
    • https://weeb.nu/userfiles/file/xugiwujunopubaxoli.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089e16a15232---36239558031.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/valorifido.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/tp3517f129etjq83359aqkb442/sizen.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00937e19b---11210856340.pdfIn PDF document text
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/zalizumuwaligotudotasime.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/21673598914.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/nebanopuwo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/494stpu35rh0dud2f6in85qnrm/73099524032.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/wigojaxez.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b294ae5935---pudeg.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/15854159650.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadb207c33---59712385877.pdfIn PDF document text
    • http://www.klimavill.com//data/editorfile/23199748919.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5d7652f74---16285735363.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45564584bb---51136257209.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/bazuxime.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/551f04a502996f8945a7b34ca4ff8d3c/15751502426.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbafd657e95---96967576185.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/64235871981.pdfIn PDF document text
    • http://kaies.net/upfiles/2107200620126300278oa13a.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=kaba+kamene+study+guide+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_off0000edc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC8 11012 bytes
SHA-256: 95f5bfe5538c3e1a682a3ff47e1837f189f495b3fb19db9d2c7b96e2af8a2a34
font_01_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 17860 bytes
SHA-256: 77bc0a6185de49eb45b5402e891b35347db51291f6ff146bf5ae7be373af616c
font_02_sfnt_off00013559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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