Malicious PDF — malware analysis report

Static analysis result for SHA-256 430abfa68148940b…

MALICIOUS

PDF

75.2 KB Created: 2021-09-09 19:06:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a4001bca3885decf4b50951f83f70cb8 SHA-1: 6f7a31023f3eea8f4fccc6cc6fb190f21fed9b54 SHA-256: 430abfa68148940bfdc0e10e438210e9af14afc3cb5796e218b94f11a2f1db2c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://cructi.ru/uplcv?utm_term=halliday+and+resnick%27s+principles+of+physics+11th+edition+global+edition+pdf PDF link annotation
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613342ecb68bd---nemimegep.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/623b8b0bf9fe686dcfd5191001806fa8/25990570730.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/77976283439.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/masetulujofovujonilofe.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/6deb8898f7c961fecd4adfee8ee03c64/46533691374.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/94119619079.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/13167554496.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613693f1735bc---pivudowonok.pdfIn PDF document text
    • http://elskenecologie.nl/files/xarumawaz.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/44945451892.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/jufofuruwewikebasuruseso.pdfIn PDF document text
    • http://intproplaw.com/admin/uploads/file/38166617464.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161368cc99bbf2---zuzizavanapowogodezak.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/siwudelalu.pdfIn PDF document text
    • http://cen7dias.es/userfiles/files/pefezibesevelalusapodibut.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/sezese.pdfIn PDF document text
    • http://word.mn/uploads/assets/30707137396.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/fegerekaxowikanib.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/xesusovitabekikadota.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/jakubowanunowopovubafanog.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-6/20210906215143124697.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/faselupulazijazasalosimup.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_off0000b799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB799 11320 bytes
SHA-256: aef8f7211a7d46500eab4f9e4f53fc876a50c9d1f8c745d1e5ba35199241371a
font_01_sfnt_off0000d1c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e9da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9DA 20000 bytes
SHA-256: 30aa1b0af0f7f06e4bfe1ab68f17d390913fb8dbb280f625bc0ddaa8c8d91ec8

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