Malicious PDF — malware analysis report

Static analysis result for SHA-256 e319af775ace4104…

MALICIOUS

PDF

83.2 KB Created: 2021-09-09 11:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3687b7a869b5479bd01add4a316c0e3a SHA-1: 75c006a98538f78a694a3dbba19f15cbc427c407 SHA-256: e319af775ace4104f0305730fb7ef899bf79705339e22e3eaa100775d43e372f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly suggest a phishing or malware distribution intent. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://kraski-chernila.ru/resources/file/2314369993.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2e8e28c7---vawata.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137243cae1d0---2056241231.pdfIn PDF document text
    • http://motoren-adachi.com/js/upload/files/lusijovuravaf.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/rapukunijatadanonowijew.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/katexijowelapimod.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/93809184085.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/temunufe.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/671b5ddc59031b9bad6af4a79b964d79/17366561892.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/zifefanazozizibo.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/detifup.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/gilepaxudagebutosopijoba.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/burekotetarubukapixufa.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/sotirowas.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/pasuraboso.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134c51cb06ba---vemikalopenajakokufu.pdfIn PDF document text
    • https://bak.vn/upload/files/35039807278.pdfIn PDF document text
    • https://garraldaarquitectura.com/garralda_userfiles/files/64408307784.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/rolejaveduzoxoj.pdfIn PDF document text
    • http://deforma.it/userfiles/files/55935684709.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/81192220040.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/3974816104.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/18559588139.pdfIn PDF document text
    • https://menu2uplus.com/images/file/84304403193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=nitro+nation+best+cars+for+each+class+2020PDF 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_off0000ddfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF60D 18384 bytes
SHA-256: 65ee3d3c7ce2d7d6c81ed623b0ff5937bb559e807f2bce6b8dbe38b7b26a4ce5
font_02_sfnt_off000125c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C1 10792 bytes
SHA-256: 0ced2be4bcbe914562f27fea8d8ab18def484d85b327026b6691cb4d662c84ce

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