Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ab33a0772c737b…

MALICIOUS

PDF

105.5 KB Created: 2021-07-17 00:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ed914af8c86ea0c03cb7c685addfbc5e SHA-1: 94479eb0a82deb3a299e415c5a31145d9c2effd1 SHA-256: e1ab33a0772c737b4096503cbe61830f1aeb2a1f15f51ad313acf12d775487fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a793224601f---xexuwok.pdf In PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafa28d29d6---61914473677.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/55099099727.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/13052236993.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/feteke.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160d98178807bb---62188290975.pdfIn PDF document text
    • https://pellevah.com/upload/files/32943301541.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/fd929933018d334b53154e89a6f66104/ruwixozubixidet.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160866418293ce---makute.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/vemekemanubolusig.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/50655101725.pdfIn PDF document text
    • http://soupworld.de/upload/file/berodoro.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/ludunerijufa.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/vafizupujadusef.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/0ebfd960cf43d3cf2e153d81608b4f3e/78819081211.pdfIn PDF document text
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/29977650014.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981c4ba130---juwovutugeti.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867abc27c---79437179494.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7040d74c1ec5222710d9e4e23c1a70d4/vimusofe.pdfIn PDF document text
    • https://hanul-muresenilor.com/wp-content/plugins/super-forms/uploads/php/files/dqprvvva9fjibrm389tpl00bei/40519622199.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708210ca2dd---17126734586.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe374e3cd---gubuwigujewazixezuvej.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/25456315077.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/20367601857.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=wow+best+mage+race+shadowlandsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13518 10944 bytes
SHA-256: 985763d184b570bc8c464ca4e9aa63bf2858256fd77ad2bf6ab709983ec3c86b
font_02_sfnt_off00014e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E25 17624 bytes
SHA-256: 3e625d848d45a98f2d157e979c8cb5bf3c4a6e89aebf5e33feef6699363de0da
font_03_sfnt_off00016929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16929 17328 bytes
SHA-256: e8f2955938bfc8ff849b1e4eb36c7b0ec521c436f5f8510bfda0cb3172176f08

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