Malicious PDF — malware analysis report

Static analysis result for SHA-256 c83b4325d6173acf…

MALICIOUS

PDF

84.0 KB Created: 2021-09-13 18:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f383080cba290d2ff98bc73fde44ea49 SHA-1: 313849b1bfe7373c8e26ca78cbc4c583eb83231b SHA-256: c83b4325d6173acf1024ab8ce724dcf59f01d4c6fb69d8ad1aebe19cf2a00bbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://coretry.ru/uplcv?utm_term=english+vyakaran+in+gujarati+pdf PDF link annotation
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16134b8b6f1ecf---vumigivunakekifalufesaves.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/62262750065.pdfIn PDF document text
    • http://qdjshg.com/files/file/bolekabixogovekixoko.pdfIn PDF document text
    • http://cissi.it/userfiles/files/81392495977.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nabamaxipaduzalolalepel.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/58580806113.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/divobip.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/86222784909.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/pavekurewasurekepi.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/14678776997.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/498a31893edeaa76fa5ada9252e9db6a/20535159301.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/74073706345.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/tigonotasadurapometugam.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/0e5a8f31d5713e969d8433eb9e2f09f0/86795001344.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/13297742105.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613142ed11de2---bofazaxuvabenuxulodiweju.pdfIn PDF document text
    • http://eternoohydro.com/d/files/mesedoxen.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2b53b8a87---nemategisifoziv.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135aad28b490---52166379920.pdfIn PDF document text
    • https://csodamalom.hu/files/files/pudotipe.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/pavofejakobonotubu.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/25360114839.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/maxusegoxajul.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/boriban.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/kesavi.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/36589418858.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_off0000d8c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D9 11012 bytes
SHA-256: 2e14e1e3e9144f0ee5f71d28044ae943f5643eed8e7dba634f99abeda055dedb
font_02_sfnt_off00010a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1D 21220 bytes
SHA-256: fa97d6b0f862b2e728ab9c46193dae7e5638c16c6d89d9c8fd88d1dc3f93d2b0

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