Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f019678d7e9b73…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 21:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c82b04fe169c92cb3ea204c56f8307ec SHA-1: f38ae724066b2240ec6156322369fc6d953a500f SHA-256: d5f019678d7e9b7327031540a049165084fc12ca88f9582a2d7baa1d20eda02d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the link farm indicate a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/bcb0e7770b1e6624f0b1d14dded8c626/buxebaruvonelexafive.pdf In PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/eb1e51397c11e6f5f8711dd43eb351a8/xusejax.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/lukejuwonigezapipi.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160accce78752b---69850580812.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/541343f6a1f126b13e3ed6e4c725e868/gosulesazafere.pdfIn PDF document text
    • http://uci.ir/userfiles/file/90341041756.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/gixiguzazage.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/xojidexojizixuma.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a19bf1a4710---98111380514.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/vevor.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/87347565528.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa1b828398---71477238623.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/6u2c3ji7tom2lb28eql68nk6b5/23342309940.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/24965744809.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/pukowifunibemuwamat.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/uq9ndk57g8c46q4702ahmolnt2/naxuduse.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d7899da46---bubixuvavavesaduzoj.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c1dc74745---jetolo.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161060f19b7887---lexunajomidorug.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/27370798350.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/20428018049.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/85a546adf5a8dd53f39c745bc97e0000/dolatazezigavonumaloki.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1cd9ba5608278b3fccaa95f7afe6f3c/25158165149.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=advantages+of+using+ict+in+teaching+and+learningPDF 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_off0000b955.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB955 14300 bytes
SHA-256: 5a86d9553c2f23f5f02e0741e73edf2cd94bd760dc365b012351d9751023cf58
font_01_sfnt_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 10900 bytes
SHA-256: 33bccc4571943537183c05a4625922a0dbb00d70ede2eae13dcf92d6b9e73f58
font_02_sfnt_off0000f5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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