Malicious PDF — malware analysis report

Static analysis result for SHA-256 91dfb4c15a27cee3…

MALICIOUS

PDF

74.2 KB Created: 2021-07-04 02:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 123a94b579d6adb4b2ad6259716af834 SHA-1: da3f9add4c9be8280f7699f4ef766031d8954eaa SHA-256: 91dfb4c15a27cee3137dab7b1ffcad9b51b31e1d5cce50b10bb28d7ba013d6a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.toptehnik.si/images/17793205198.pdf In PDF document text
    • https://nikosdimos.gr/userfiles/file/pezefuj.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/78400321653.pdfIn PDF document text
    • https://familienarbeit3plus.ch/userfiles/files/rokuwu.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/82065145024.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/950924f49a2540d5388537415f175c51/rosetujoviguxet.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac253829f46---suwodaz.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/0888125747f3101f4b1aa33fda4c75a1/62507593212.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/xavojubavulifedeledoder.pdfIn PDF document text
    • https://noddy.nu/images/file/9724354058.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba8a68e4d8---dufitok.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160766dd997367---634569299.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/339936d53962fe8633f595feea48dd7b/zowemomofitu.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/25149751839.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982ab2ce974---54055114724.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969105d918c---vabusakaraxunufega.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/8a6f5bb5e715d6a270cd28dd824d8279/5638371142.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/1013a4c19ff1e779454d784fd48e490d/40169142632.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/77705557853.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/moxabaraxituxosonop.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4953ec8baba817dde5a94b1b34e46b31/85042492018.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kunamurus.pdfIn PDF document text
    • http://brlairport.com/images/file/pudatiterod.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/uevm6h9l0s6mk6eog5kt556krp/doretuxelawudewipoma.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=mays+pond+bothellPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC02D 10544 bytes
SHA-256: a41d9a4497dfc6c7b99b242c11fdd8d978c7234ed251c54e38b1b27137e49c72
font_01_sfnt_off0000d7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16988 bytes
SHA-256: 9c0c3751e450bb1ddde0ff5ccd909480ed485e5c39f07ea359ca4609f0977745

Open this report in the interactive analyzer, or submit your own file for analysis.