Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c13cbc72aa6e0d7…

MALICIOUS

PDF

70.3 KB Created: 2021-09-26 02:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cbe1cd0e4eb96519caefb35f1157ab7a SHA-1: eaf11b5ed259c3eda1f861cdfa4335e938e6224c SHA-256: 6c13cbc72aa6e0d70dd22c5131cca4d69893260dc398428111520e77f23adba8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=minecraft+sandstone+house+ideas PDF link annotation
    • http://pluimveebeurs.com/userfiles/file/zonolor.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/bilenejavukilaloteli.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/13438368281.pdfIn PDF document text
    • http://chenruichem.com/upload/files/peponuzukozobebuvumes.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/8e7acb9c8bf8fd8dae9d1350b5ec8c5c/vixom.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/16840570855.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16148128e13d8a---tanizisipim.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/xenofugotusajegepikuxibi.pdfIn PDF document text
    • http://seattledesis.com/fckeditor/file/duwebejapi.pdfIn PDF document text
    • http://gowowdeli.com/uploads/files/11382137402.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/vuvazawamawakelare.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/momibadejolezegigow.pdfIn PDF document text
    • http://shahgrp.com/uploads/pumumavobiwubevipusasufo.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/95442422290.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/lazekumimofinutone.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/17598547330.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/jobogebusesag.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/91ba0ec425380402e0be60609d2cb036/84396904117.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16143fdd44e503---29348434817.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/65040518087.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/16391718407.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/wipuz.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/50058249591.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/875411c69b80588d549e9d43884ceea0/5107658666.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_off0000b214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB214 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 15908 bytes
SHA-256: 2de80a2ab8dcbe80d6a4c45bec2a1b4f03a35c878dc8c31bb75d96414cf6bf4a
font_02_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 10620 bytes
SHA-256: 4567038c3210fb1117c47bb313a2673eb2a8a52553ac15034344cfe9cba0fb92

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