Malicious PDF — malware analysis report

Static analysis result for SHA-256 59fe7f4e12fc5d68…

MALICIOUS

PDF

77.9 KB Created: 2021-09-21 01:34:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bacd54ab8bf5f928ea154d3cf921d75d SHA-1: d745ef44873608c1a74c28b15379e13db9b5bc70 SHA-256: 59fe7f4e12fc5d68a353946e9c3bc6d1fe5f9431761fe5a3b9406b75fe27f6b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing lure, likely involving embedded JavaScript to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crysiq.ru/uplcv?utm_term=excel+to+online+pdf+converter PDF link annotation
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16137ebb5f2f52---277613497.pdfIn PDF document text
    • https://luminex.pl/upload/file/52035944476.pdfIn PDF document text
    • http://louisamerino.com/userfiles/file/kamimokarodiruxoneweg.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/wafosozefizugepizoxi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614222f476ffe---vakipapapo.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/bewafodosuxajuzofebifita.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/95748880434.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/29447244762.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/xutexadepusogogebonanune.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dupibupegisanewi.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/67871749651.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/96078097000.pdfIn PDF document text
    • https://clubon.top/uploads/files/44090961950.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/2vijvn7ie3eqv8rpuhvddd5vq6/16649898748.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/67685951377.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343d7379d02---mivepuzepurupobatal.pdfIn PDF document text
    • https://taucaotoccatba.vn/images/news/files/1077124896.pdfIn PDF document text
    • https://everestart.com/images/stories/file/52772026761.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141417417645---19515335886.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/durevu.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/zufirofejuf.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/716727507.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_off0000cd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE591 10436 bytes
SHA-256: 9263a9a9fdad76e35a4a9021dde1630bc0af83b40ab50db496266ea35fe3a9ce
font_02_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 17032 bytes
SHA-256: 5b27c2e25c7a7b485b9635f589b070c21566ec366a1f1159d9133d99a662a224

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