Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c695d6461564a8…

MALICIOUS

PDF

88.7 KB Created: 2021-07-21 19:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8cdb144bd3c526390b499457c776589a SHA-1: 81f488fcbf7204eb297a066a9788d36b5e69d1ec SHA-256: b0c695d6461564a8aaf1a05b1d735fe537dab32e2cc2fc8d2748de42bc056ab9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It functions as a link farm, directing users to numerous compromised websites, likely to facilitate further downloads or phishing attempts. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, as does the SE_DOWNLOAD_BUTTON heuristic suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://boumqueur-edition.com/upload/fckeditor/file/fasumozezonepabuvod.pdf In PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/56977907432.pdfIn PDF document text
    • http://jaika.in/images/documents/files/788878305.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160820e9e50cab---80692785446.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pedazame.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/sozun.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d35f6c9a8c1---nomij.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/97436602452.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/397a7285881b1f43e4114f5f1a2381e8/37235608451.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160815199596fe---leligukasewijewixuvo.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/18152222555.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/j7badgskbscgckvogii0675tm4/selobajafumijufibiwobuka.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/4877941442.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/895cb1e4161a4f9794cf18e8b661c964/dabatipebexedunobup.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/wozuxezawedil.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/rojawufezajum.pdfIn PDF document text
    • http://beiks.info/public/file/xojopefifiwepetavunepez.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d90eedcf627---jeviwaroponorubi.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/39011879304.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ab208a61b9a628dda38491806cda1ecf/lowarutizageletijidasas.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/8b2282321f4d7b5632ebb374e46ace3f/zivub.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/vune536tj0oi0buukhge8r9tkd/54301737617.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/folidupu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11b6dd651---kefejemutisezazimeroxoko.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beace62ea65---13540497425.pdfIn PDF document text
    • http://shuswapladystriders.ca/userfiles/file/1948602273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=three+times+tables+worksheetPDF 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_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 16920 bytes
SHA-256: a90258b0e4a6ebd94a01388edbd1899a2cd816232b3f8e26f6d18a3fad6eaead
font_01_sfnt_off0001240e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1240E 10552 bytes
SHA-256: 8a6c6d0305989dc01578440827a32fefa3c6374f3d41c6d74ef4c289eaa96fff
font_02_sfnt_off00013c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1