Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6ed78b76997010…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 09:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5e53060e9e83610ffd0862349d529043 SHA-1: fe2b08c8b762a9f3154b8d5fd96689225d4930de SHA-256: 9c6ed78b7699701015dc2dbc74e384460f8a9d89c18e85efe4855055d9f61445
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a significant number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/qd15us38eich9l4mq9bfnvqu1c/xefajoferutu.pdf In PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608db161642a9---bidipenomanuvuvalefa.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/48968306924.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/78379392775.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/af9cd3d3026a783c5592a590c402f9b2/74503528673.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/zoxoxef.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d2603b3d1---gupoxetagojawamowosugadel.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/jogaxe.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/nuraxe.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/momusavu.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/21311558092552493d2613d167b660ff/42286512644.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/pujiwaxariwofimi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16075c63704b8d---39434124233.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///75806324080.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/55314506099.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/68803120596.pdfIn PDF document text
    • https://bachson.net/upload/file/sumonigaleteluxekaved.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/lonefuwirape.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/zafukivoseseni.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984458aff18---kesudixeladedalefewuda.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/3jvqjf9g0t63snchqe0sopu41u/71132665218.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/73d4dff418b54c8d49f748d4d5d99cad/87543883627.pdfIn PDF document text
    • https://speak82.com/_UploadFile/Images/file/67756772623.pdfIn PDF document text
    • https://luminex.pl/upload/file/tugovawil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=free+downloadable+coloring+pages+for+adultsPDF 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_off0000d62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE42 11100 bytes
SHA-256: 743974567166d095b47dbd97573fe28af9e89cb1be9ee7933c83a1b8d1477c0d
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 17256 bytes
SHA-256: 49f9bdb9f4cdde9679ef5b79a9dfd4300384c57918c8312ee3d9fcda77986012

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