Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9c9a16256866ba…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 19:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55aca83e93a3cad93d4d9ae7f86a2059 SHA-1: 878d721d98bab201766b0482d5fb677d4c9780be SHA-256: dd9c9a16256866bae394a90ae3f5756aa59c1d08929c73e9f785a3d45bda2460
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggests the document is designed to trick the user into installing a browser extension or update. While no scripts were directly extracted, the presence of numerous links to potentially compromised WordPress upload directories and other PDF files points towards a phishing or malware distribution scheme. The document's structure and embedded links are indicative of a social engineering attack aimed at compromising the user's system or credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079c87793ad7---sixanuge.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16087776a8f121---gowesizirot.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/74285540594.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/c72640712e900f0169a274cc8bf15369/guwomezinugev.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/8f72a65a7b94ee7616c535f0112f26bb/45037394803.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/kifizepuxuli.pdfIn PDF document text
    • http://europavloeren.nl/siteimages/file/firexiliwodekuxirodaki.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/62347390203.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/44948172685.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/dadim.pdfIn PDF document text
    • http://qdjshg.com/files/file/feliboxuvekudemo.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/7cddce988f7abf30101bb9ab92a55ea7/pikafebodafisodive.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/74805177495.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/xupariwemibamivemijake.pdfIn PDF document text
    • https://hiroyoung.com/data/files/45444895905.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/5226100060.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8cmqs0o7n30040kj0j2qduf9q5/wuzagiwomaxom.pdfIn PDF document text
    • https://medius.sk/userfiles/file/rilugazunebakinu.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/40399302912.pdfIn PDF document text
    • http://inncredel.com/uploads/76795626712.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/xudekipumanep.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/0953ebafe91514258694f2628e3bdd91/piluzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=college+research+paper+outlinePDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF051 17308 bytes
SHA-256: a3f5175e66e43021a702b8f0d310db3a09811e43164d3be738e2a86e2d359a24
font_01_sfnt_off00011d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13544 10784 bytes
SHA-256: 2742856ce6aecc0c7f2903bf3fd92e1957b4e09e1cc539e1e6cd8850c209a8c6

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