Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d156c2a51beb605…

MALICIOUS

PDF

84.9 KB Created: 2021-09-03 16:59:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70bceafe987b9faa42e8c65a566f27da SHA-1: 55770e0774120fb30cc9dec7d80cdc73ec94e565 SHA-256: 6d156c2a51beb60549ee2d6366d7dff8f9f9da4d07093be3ebb76e668ba3b8f6
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs indicate an attempt to lure users to malicious sites, likely for credential harvesting or further malware delivery.

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://crewmak.ru/uplcv?utm_term=traducir+a+espa%C3%B1ol+pdf+gratis PDF link annotation
    • http://weberstellen.ch/userfiles/file/65913438971.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/vamedanakoduwudipumew.pdfIn PDF document text
    • https://bursac.net/userfiles/file/topibu.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f47c5a136d---zifuxagore.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/30156328289.pdfIn PDF document text
    • http://www.dreamstoreonline.es/ckfinder/userfiles/files/vabogefine.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e18b508b---sigasexidub.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/wamopil.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bc106c008d243cf95ba16c76f2d55ba9/bobolox.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/180166171360ccc81d4f33f.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9b5fa3fc1---30802862389.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160722ca1be24a---47843395272.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/fetufudetopowu.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e97444c4---91393817483.pdfIn PDF document text
    • http://modellszerviz.hu/userfiles/file/vemedez.pdfIn PDF document text
    • http://beiks.info/public/file/37288050004.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/dizimirobalowo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16075f1644d04b---64553156595.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aeb3c2b3f7---60051013942.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160944f71725aa---66164007885.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/tepulukitupana.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/98564939293.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062818203173499.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/metifupoginenubus.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_off0000de27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE27 20468 bytes
SHA-256: ec46ffa8c2872674727f5529042a5e36ede753ea9a6bd36818f877bd61a9cac0
font_01_sfnt_off00011267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11267 10960 bytes
SHA-256: 6b147ac38bf108aa579409d77b20e4829c456f128555a0ccb531eb40917b9ea3
font_02_sfnt_off00012bb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.