Malicious PDF — malware analysis report

Static analysis result for SHA-256 40d6d27a72d30c69…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 02:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 54fcde83942507b5316ccac76b7a2b6e SHA-1: 68b5a23c057b11d06178ef52ccec507c43d2db17 SHA-256: 40d6d27a72d30c69891c799842d90164a97a3e4df17bafa85c5ddbf4fe52d6c1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure indicate an attempt to deliver a malicious payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=dislocated+thumb+knuckle PDF link annotation
    • https://ises.ca/phpsites/vertical_living/uploads/file/86114593112.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/8d78c4f2189cd52f332e964db49cbd2a/83703039847.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/piwopivuripesaja.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/4734174289.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/e050ed8495b069ca8b971716677818b8/zalesibij.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/gifogimovu.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a791bfeb12f---6763676422.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/gafitun.pdfIn PDF document text
    • https://capital-tic.com/upload/ckfinder_temp/files/20210528232633.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/kukered.pdfIn PDF document text
    • https://kogan-photo.ru/wp-content/plugins/super-forms/uploads/php/files/5197ff10e7f4c9db4beb24918d83ae79/liloxokat.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/442a9c88c4dd56025e4c9c8b37cb3f1b/22064031801.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/5a000ee74d98affeb0565b9dc7cf2fda/miwoboxakafeti.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8c69954c---kebidezewegibexuputo.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082b1cda271a---xavivog.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160acd93d05f8a---nowifuvefutopikagetawej.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/fufuwekalexu.pdfIn PDF document text
    • https://ikima.fr/uploads/file/dizivunikoroxi.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b5458ad4---17937114328.pdfIn PDF document text
    • https://doktor-ara.com/userfiles/files/50949639452.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/06/19/fisukimukefivepokus.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/3848076fea6ababc9594858d69dd07ff/15362889088.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dac2c6a1d---laromudojig.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_off0000e62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62B 10868 bytes
SHA-256: fd318b64c37d23998d9ff19233d90c98f0e1b361ebf29c8ea40677f0a345f0aa
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 16616 bytes
SHA-256: b6f441430d71454bf7b5d5dfc9286d7499334906fbb10d547e669e0fabab56ce

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