Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a11146a0847c9f5…

MALICIOUS

PDF

76.7 KB Created: 2021-08-11 19:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9ff36852c55868d30235e70f1e848a84 SHA-1: b5759a91d24ad40cbe6cecbc1ee309eaad21fdda SHA-256: 0a11146a0847c9f5fe4a438b982e58e91d47b015bb715a54b0c84ef2e92ee54b
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection further confirms its malicious nature, classifying it as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/87c2ad06267691f31f99536d88230561/buvizasinalikujo.pdf In PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/5a1026595ed7c5c6c138c61adf6a03e4/91070005887.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa33eb4fc08---wixopidomekevifiwoxemu.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/89838171722.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/domubulifebuwuxopitofaz.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee453ca5b01---wekak.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/bewajadosepanonas.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/26285438370.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e279c894384---27400715024.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/jebol.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0810a460f312a8d94bf5179be1b9e82f/telisusujarupozivafuf.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/5f3nshm6q9e7hh1kfe2jmvg893/17086426733.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/88a439bff9b54cd041a1cff512b46615/rokamivunezokomunamafefus.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/99128196491.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/wenetowigazijokobezozomo.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/29nhm4r0iloelj1lp408e90gi6/71036638907.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/9e7186ec5b3cfde6143cf3fb0bc6ec9d/31463303657.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/0619022012.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/47063583423.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d35a814e---piwuk.pdfIn PDF document text
    • https://digireg.it/upload/magoxenawuk.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/pupefer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=engcon+ec206+hintaPDF 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_off0000c7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D7 17188 bytes
SHA-256: 94833e394a1d1cc4db8cf38d2982382ea1815f8b7f9b007d5a404d08877b7fd0
font_01_sfnt_off0000f3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C0 10588 bytes
SHA-256: 173bd6b9d3b8ef2238aa370e257b3302b6258cc08ea5b93f1b6da127ea7b03e4
font_02_sfnt_off00010bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1