Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2df3700bd9735a…

MALICIOUS

PDF

86.9 KB Created: 2021-07-30 20:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fb851ea880ff52acfbcabe10343d16b8 SHA-1: 869e6d3846f9f710d0a94dde3121ba5afab625bf SHA-256: 1b2df3700bd9735a603e34015dabe9aae2e6b39b2556ed5a36615078b970634e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a large number of external URIs, many hosted on compromised WordPress sites. The URLs appear to be part of a link farm designed to redirect users to download malicious files, as indicated by the ClamAV detection and ML classifier. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • 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.
  • 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://queure.ru/uplcv?utm_term=winning+eleven+2012+apk+download+konami+for+pc PDF link annotation
    • http://medica-brno.com/files/73350861897.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/bexuko.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/90906311743.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160778f903e464---24329809601.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27eb40b8f---texojejowavigibitarure.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a06a21ffb9---zigolam.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160fc44439ad7f---28578507049.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/81897110657.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/vojejanawoxinazi.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/gifapugepujidewoxat.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5908c55ce574d81e2bbf8aed10a82871/gosiwun.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/4446bcdb124318218c174d87b6d173b4/kupurajufegugefagixejuva.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3f578862b---rofukavafepebuxatakevij.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b6c4c182---95976636411.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160be3ea4df223---13170764252.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/dixobo.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/18238572290.pdfIn PDF document text
    • http://goref.ru/files/file/biwojil.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/tomiburope.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a853d161a9b---34104781287.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/d3a2bc701106820548c90124e7802b80/32323870707.pdfIn PDF document text
    • http://standardamulet.com/files/files/wobozevirav.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079c996f14f7---58457286992.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_off0000ee26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE26 11228 bytes
SHA-256: 4fa1ac546e6c173087825d77e853406b7453d007bde3151aa293d06fa2b5ec7d
font_01_sfnt_off00010851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10851 16360 bytes
SHA-256: 3a627818b1afb114f4e774da41ef8a346e53aa3e67586c636731b1f3f44d61a7
font_02_sfnt_off000132ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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