Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd13ceb366380cea…

MALICIOUS

PDF

83.3 KB Created: 2021-09-05 05:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6eee6c087ee00b5dee0ff74354ac03ba SHA-1: df2633cd7e039405139011f8d9cc955f540384a4 SHA-256: dd13ceb366380ceab53c509a3eba25e330d841468a509269977de15ec14592c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, many of which are WordPress installations. The presence of external URIs and link farm characteristics strongly suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=best+free+html+to+pdf+api PDF link annotation
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15ffa3277---87782854538.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/43322589291.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/bobagulawebivufotobu.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/rapaxixomakonupo.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/24179491394.pdfIn PDF document text
    • http://scpt.it/userfiles/files/58255169513.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/42609766845.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160771568a4af1---gudedeb.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610e1e3a8e9cb---49116356276.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/lagejike.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/vutovawuwabofof.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/5h70mg3q8qcq64dnarsq32a3j4/voxidurupijenozijejusasop.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/52375368329.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c493d42a24---sozawesuzexaninumorosoj.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/xuzowunudabojinelexi.pdfIn PDF document text
    • https://www.southdownscellars.co.uk/ckfinder/userfiles/files/11981136633.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/52efea1341dbee8f7f14ac20f2d4c4a3/wetizimefefo.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/kerulajesajadirepo.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d22bbf8f794---magovurujurepel.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/garojemudomelogija.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/fivoberawefododezozuwom.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/14265734848.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/64725007288.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/vojimupotefi.pdfIn PDF document text
    • https://pdfshift.ioIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC7 18580 bytes
SHA-256: dfbbf79472f7ca74bccbb8c1fb346fe50badf6bbb3d5fcb75668155d32e848ab
font_01_sfnt_off00010f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F04 10712 bytes
SHA-256: 2c003799452d77419507251b13a59f7256a3802c61937a37fc149286ee11e1a9
font_02_sfnt_off0001279f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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