Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3979eec924a855f…

MALICIOUS

PDF

70.9 KB Created: 2021-10-01 15:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 152cf1fe85fb690542a0d18e82541da1 SHA-1: 3840d6644c8a40622a885d80ca97e06fd61b966e SHA-256: f3979eec924a855fdfbb2d1a389dbc83808743db3f7d7bdef72739b6f69454b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing or trojan PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pistant.ru/uplcv?utm_term=the+devil+made+me+do+it+123 PDF link annotation
    • http://fields-on-earth.com/images/blog/file/88981927564.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/nifajiwexifu.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/69735316871.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef9e6f1d95---megominijosos.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/nefudonesakul.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/63870519005.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/5kidv7lr98oqn6idm0q3g95g3e/gabewok.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/datulikawawalusorexete.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/xuzuzasorurelaberofide.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/un84ha2l6shciba8ih2f41l9td/11499484679.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/53027753295.pdfIn PDF document text
    • http://vektor-bezpeki.com/userfiles/files/sogitodamitikedogepam.pdfIn PDF document text
    • http://e-hematologica.com/users/file/34764855267.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/lalapozufapum.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/39245916588.pdfIn PDF document text
    • https://5974293.pasarantogel.com/contents/files/lozuvolusanime.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/tasivit.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148a47563a76---verodugel.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/dedejolewuxazomilefowivi.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/dilimaxerezalugomafobup.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/66995339594.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/mebopanigaxonezu.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161563143849dc---47482539353.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/afd86916c5cd8cafdeb010b256b9e258/vupen.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/vifibetolixomakibizoligo.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/jenigasun.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/38105400832.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1615410c3e250f---kotefoxorabukepaxivanixal.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_off0000b5a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A7 16076 bytes
SHA-256: 9d6d2209b7e8beea5640c4e0478c978c655d0c9fc7052aa47fed262c842903ca
font_01_sfnt_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 10516 bytes
SHA-256: 448b395dd74b59585de250fd46d280187a7799d7de97e7cd84ec4d3e39607ca3
font_02_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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