Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8331c1c5b7324d2…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 12:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1254a26a438676d7e9bf3ecbad0fa74e SHA-1: f5c8016bbd084e258bf3eb509d7ae201313f23ba SHA-256: f8331c1c5b7324d21c02dd5182189a0ed0439b25738fb17f629a1013f180a3f8
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV. It contains numerous links, many pointing to compromised WordPress uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://oniceh.ru/uplcv?utm_term=queen+of+hearts+watch+online+with+english+subtitles PDF link annotation
    • https://skvely-kup.cz/files/file/walikogegizemovewuna.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/tujokef.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/lipalazimujofezewejew.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/wupekeg.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/xijuleguxafamawupu.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/fosekumodiba.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3b2e4a65542eabb007e2fa88b5ec86a7/68884870481.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/pazewujomo.pdfIn PDF document text
    • http://dralituncer.com/userfiles/file/57249460735.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614355e954772---76376284844.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/89897411740.pdfIn PDF document text
    • https://stpatswatertown.org/ckfinder/userfiles/files/99642389340.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/vdhemgnv3ik5ek4meqpcblme52/bekigezazowezixirotofelez.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/38484519911.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/lozevewinis.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/xoraleweliwezerajewodul.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c801c7d975---sekufakaxizopisebuletez.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/ninawezafulikibofan.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/80580302718.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/dcc3660446b2e01e43b8fe7d25ad3453/sebusenidurake.pdfIn PDF document text
    • http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/dorepepubugekotudobu.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/85886716797.pdfIn PDF document text
    • https://ghadir-eng.com/userfiles/files/bubewepoxus.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/21267903687.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_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 11000 bytes
SHA-256: 3542493ab92ff7954fcf37db292d9b89a63ee4d2fb20aeb44d0217fcd9eacabd
font_01_sfnt_off0000f1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C7 16384 bytes
SHA-256: 7ebd2d93f5bb4424c602ca5a88cda2682815738808421c8f4a74a5765fa5ed4d
font_02_sfnt_off00011be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.