Malicious PDF — malware analysis report

Static analysis result for SHA-256 90134007ff95ae52…

MALICIOUS

PDF

92.5 KB Created: 2021-08-05 08:55:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c1647db9acb39a4006cfbd27cab9d3a SHA-1: 7ef3269bc88150698f4f3eea696d7c30e4086f00 SHA-256: 90134007ff95ae5208bc34d8ecb92e56094238c9ceff84abd5b8639cd6bf6eba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, presenting numerous URLs that lead to external sites, some of which are hosted on compromised WordPress installations or disposable domains. This suggests the PDF is likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://medvor.ru/uplcv?utm_term=what+is+bpo+simple+answer PDF link annotation
    • http://churchillreunion.com/clients/72216/File/sosobakiwejuxafidutev.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/69261556620.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/koxaxosigofimumivo.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/mizixugul.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/kg1808vcu8dlamg9u15e28fsfe/xiniful.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/vevokibejev.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/46b6ef0c2bcbaf3756b61cfebed4e5ac/29511829903.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1607588b4aec21---56060698362.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/198vu661dv44ac1098gorlqnql/11192262132.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/5ed817a1f969ee627004945fc9e4a057/23011223486.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/314b6e53cc8eb3f7037d9d8d7337679f/pibijewepavitebaja.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/9863474212.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/pirugif.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2tebm7173r62ii4asgif00sh37/zorazuwukexugar.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ec0febe0a---mapazelugukenorase.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/qssem54s5nid1bqno93c0roql6/73474351585.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092cc6fcd86e---nopikebedazexarajivewado.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/61615587039.pdfIn PDF document text
    • http://hangquangauto.com/files/73361167354.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/57aeb84a9d7d83aacd48b5113b968b5d/ramowupamajuru.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609d12f618ccd---marozum.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/boviwutuz.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/44798730280.pdfIn PDF document text
    • http://permagnet.com/upload_files/file/2107262029173364360cjxcj.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/70901253470.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad225ee643f---59664800678.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_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 16852 bytes
SHA-256: d4d8f775509470f68be2d483bb0d4ec12ba4f4274acac0dc41c29b45baa155c2
font_01_sfnt_off000132d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D2 10736 bytes
SHA-256: fd08771f745042d268f4b621fae9bc841322b1f57770f85e501b30fae60b1e3a
font_02_sfnt_off00014b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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