Malicious PDF — malware analysis report

Static analysis result for SHA-256 be53929e4fb71133…

MALICIOUS

PDF

74.5 KB Created: 2021-09-03 13:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4bc896d7e4f3c6c9ccac31cc67a2b7ed SHA-1: 86bf4056fdebea34df4178cb7a4840ddbdbc35b0 SHA-256: be53929e4fb71133195708627ec4400718baa3aee1e0b34348be657702a576fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous links pointing to potentially compromised websites, indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The presence of external URIs suggests an attempt to redirect the user to malicious content, likely for phishing or further malware delivery.

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 https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/v91fdhpo81batta53rgj81netc/28625050200.pdf In PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612acae39c635---97036312173.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/81629854933.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///24793784130.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/77463106871.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/sutalomakubuxulenod.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4450c281d5---muzomobete.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/zavewuwidiginodowagomi.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/pixasafibopixepobasin.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/10424919123.pdfIn PDF document text
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/pizaditatikufulop.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/ragogem.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/23030513899.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/64253647646.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/sanaxe.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/14116654777.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3eddcb9d88---30528339106.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080607171767.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210613040622_blgyn3.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/78971565647.pdfIn PDF document text
    • https://peterdegendt.be/file/87534170704.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121807b950cb---56253829751.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/wizutifijuzotixetoroxen.pdfIn PDF document text
    • http://miryangpension.com/FileData/ckfinder/files/20210804_410561D8CA1F7822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=mr+tambourine+man+piano+sheet+music+pdfPDF 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_off0000bee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE6 11072 bytes
SHA-256: fd7ff0feb5b0da99f6817950b57a5c5c9f9e9e9c6640a931a030d0f9ccb5e516
font_01_sfnt_off0000d84f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF061 17344 bytes
SHA-256: 108c6e5257dfa2e56519fee768ec621921b629c4f1d764887a790d12f8065629

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