Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9de319377a95013…

MALICIOUS

PDF

90.2 KB Created: 2021-09-07 02:30:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29be29f8545f52975d8307d7d9f08c8e SHA-1: 250c6d720416ed17e111c15a623594525291b52f SHA-256: d9de319377a95013fccb858a413938a2d84f6246b8cbc4d257ce68b79aedd707
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The embedded URLs, such as http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611576f112d7f---23356549703.pdf, are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 http://e-hematologica.com/users//file/55873483944.pdf In PDF document text
    • https://rajatotogroup1.com/contents/files/muvonizopapo.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/lifuwonemuzawadajenap.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/83804704724.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609981dadda42---69517300675.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/161340a47428b3---79818700523.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/90312502445.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611576f112d7f---23356549703.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/91077780432.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/mutejeve.pdfIn PDF document text
    • https://istanajp.com/contents/files/63878303957.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb39bb84d---74342965607.pdfIn PDF document text
    • http://app8itebarandgrill.com/admin/images/file/jodizofowazepotexu.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/44359511925.pdfIn PDF document text
    • http://tinhdaurosa.com/Images_upload/files/17137611145.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e57786ea9---84430099177.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cab5afb34bf---ranovimerinut.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/20949196466.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/96530104578.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/nabogopumaligaviribin.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/xokokilagamajab.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57eb014dce---22501630569.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/jijanalunukolusamimek.pdfIn PDF document text
    • http://ebanksunited.com/clients/7/7d/7da19d52c1086e69e61582739ce98a0f/File/bitosorejodosaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=adjective+clause+reduction+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f420.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF420 10888 bytes
SHA-256: e945bc493f112a964b8cc55ec7407bbeb15fed7612f255d948be042477de86e9
font_02_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 21308 bytes
SHA-256: 72b67bf0cf105e045abd29f6d0f4912ef77d73de8055a8c93d53ff58c3ecb522
font_03_sfnt_off000143ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BA 16412 bytes
SHA-256: 2d4a6969c6f313137042ad82944c676743dd5371f203dae0cb87cc58c1b65dc9

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