Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c22efc6522fdf88…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 06:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6fdc3807be424c01e035c77cfd4d4063 SHA-1: 9d6b373493d619cad22a282667dbe00b4f72b940 SHA-256: 6c22efc6522fdf88b6ad3adbf64f9f0c66e54e07ee531a262811dbc9404558c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall detection indicate a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://queure.ru/uplcv?utm_term=emerald+386+rom PDF link annotation
    • http://generaltubi.com/container/ckfiles/files/98980994129.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80040970464.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/renedorap.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kezivusu.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8ef6321e0---36502446287.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/28676881195.pdfIn PDF document text
    • http://sunway.me/uploads/file/120755245346.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/71645095011.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/notutefaxajezawebaweje.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/zujokefi.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380d810b4ad---xoketitebijol.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/22669193532.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/ponatinugezetabizubiselub.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/30281895600.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/zelotajeresine.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8d599bd81---davupuzuf.pdfIn PDF document text
    • https://kratky.eu/files/file/leriluxobowuwomozopawe.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/47952446581.pdfIn PDF document text
    • http://seamacros.com/upload/file/31849605775.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/zobezupibiso.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/79548cc1446acbaa6c3e5189817bcc4e/bafewisajezezuzidu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/kuxusudefajorafirudazaj.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_off0000de52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF669 10476 bytes
SHA-256: f87301b09bb6fc30dc98c6461beb6011c0912abd494107a2bcd600d0692e9f40
font_02_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 18908 bytes
SHA-256: 511d81ee9e8697800ff8a59bf52cae673d0e00c0dca429f54d58b683d29442ad

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