Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c19a5bf7b98d832…

MALICIOUS

PDF

102.4 KB Created: 2021-07-30 21:28:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 76d14eaeda1c1cb55dd48cf460430020 SHA-1: 7cfc222ddc3507595bb4e0c1bf1790ca729b5a5f SHA-256: 7c19a5bf7b98d83249e189da5b083403966bf7892de40fe4a70e5349f6d8736f
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure as a link farm suggests it's designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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=pathfinder+kingmaker+conjuration+wizard+build PDF link annotation
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607b19d94e189---katisubiwozekoxivi.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/durizifafuvebe.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef2c82141---fosetutunazak.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c40b1b60aaa---kebukagidut.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/90056283986.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b0dfb2d82---piwoxizumiwurokokolu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/iu12olopp8d3sqsas9m9jo9e33/63417953879.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/78731972864.pdfIn PDF document text
    • https://coastalstudio.com/images/main/file/jirod.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/runepujoxakukuxig.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-7-30/20210730001228663053.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608018117028a---12336450993.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/74925170492.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608894aa6d7ff---zemiromudirokife.pdfIn PDF document text
    • http://beateromer.com/bilder/file/zoronelefaxuju.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/24091521761.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15369db30a---goxolinaf.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076373345b9f---dilevujol.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/qpc8bocppovpfrojt80c00rb5j/viximogepalopanub.pdfIn PDF document text
    • http://medica-brno.com/files/79804523971.pdfIn PDF document text
    • http://piazzademarini3ge.com/userfiles/files/12104306627.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607939bcaa1aa---27261649772.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608278900ff65---zujozo.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/tepivuvetipawezusori.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_off00012642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12642 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E59 11364 bytes
SHA-256: 1129c9f15bd9ecd0b33bfc15755e8401ed09b400a4df71f7780a24010bce17b3
font_02_sfnt_off000158bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158BF 18728 bytes
SHA-256: 199f8a2c725975e50c722d6c44fe0fa749ece3816601c1bff4527a1a8c34aec3

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