Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d70a28d6bb3a35c…

MALICIOUS

PDF

75.4 KB Created: 2021-09-06 09:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7582b013c41c897712c61d999bfb6aba SHA-1: 39d74c15fe82d45d4f92bbfda3a7168d4531fa78 SHA-256: 6d70a28d6bb3a35cc097296a3e9cc829d74c73185b78b480a87b5dae16fc3e57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=minerals+and+rocks+notes+pdf PDF link annotation
    • http://richmore.kr/uploadfile/fckeditor/file/69971518286.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928c0d42328---lakurovuvesumup.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/49073189629.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/32720347079.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/refivewovupejoparozobenag.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/taduziro.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099059722185---pagapagadumixubataxejij.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/92071447188.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/68cd680896f0bd01c0b40d02ddaf26fe/jaxixabizutaxomuru.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a7bf6a192---57152362528.pdfIn PDF document text
    • http://hopsch.de/uploads/file/fepap.pdfIn PDF document text
    • http://www.forteks.com.br/admin/ckeditor/ckfinder/userfiles/Images/xetenagadavuki.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/70733417003.pdfIn PDF document text
    • http://gdfsztal.com//uploadfile/files/73785604574.pdfIn PDF document text
    • http://remont-elektro.eu/archiv/file/44046207438.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/serodogivedobesivesume.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e3f5507890---22186479890.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/tisovorakokuxovopuxabi.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/31733462953.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9b9cae876e46aefcc406264638e758d7/68535404046.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160fc83a539782---gazutekuvikufimajo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161187b86501fe---xazakimizupaxigademisomu.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/ao3det3sgof8qmk3no6eojo39e/81351071601.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/73895512910.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_off0000c4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A1 16472 bytes
SHA-256: 1bc137570d2ab90617cdbdf37a37abe1539c34907295b4b4e0d8538bdc27f9a0
font_01_sfnt_off0000eeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB5 10696 bytes
SHA-256: a1aa711ee3e16d1b71963c2b989da73a3e7705b1cf59a7c669dbca2d87bda242
font_02_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1