Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb605f0cc249940…

MALICIOUS

PDF

82.0 KB Created: 2021-09-07 16:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e0e9045d7c7074e6af9061763265abdf SHA-1: 8c463c717b4077ee5aeca2b7e353dfbd47e35c56 SHA-256: 4bb605f0cc249940eb4f5fc2771fc04d4d0a56e4f4eb7e65d93adfe6ba66307d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the FormCraft plugin for file uploads. These URLs likely serve as a link farm to redirect users to malicious content, consistent with phishing or malware distribution tactics. No scripts were extracted, but the presence of multiple compromised domains and the nature of the heuristic firings strongly suggest an intent to exploit user interaction via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084066864ea1---bagemelidedakabakajedi.pdf In PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/61857439870.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/vagivunevirojajopile.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844ed04ca84---79275448574.pdfIn PDF document text
    • http://tulga.ru/editor/files/tavalifesidewuzun.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/74189732539.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a653494c2---sajorusajazeveruzolafeti.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/wavunob.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/31415797155.pdfIn PDF document text
    • https://anaksemut.com/contents//files/naturidimovirode.pdfIn PDF document text
    • http://ux-school.ru/files/files/nizun.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a9079da1fc9---46638586320.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/50fc07489a946609b120cbefdc403149/kexetu.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/31246517458.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/ruxoratab.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/motozunodofunedixozatiwux.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/dazexitagokumiri.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/50143432161.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/16014629424.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/a45ea553ca4ceb6a1083a5b466545a40/1441606751.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fe7e6576d85ef4a8cdcafad552fd2342/2719425343.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/94583241019.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/17672420523.pdfIn PDF document text
    • http://vo23.ru/upload/file/20346713318.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/ebe6be9c35887fe373c38d750929d221/76969968027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=definition+of+organization+by+different+authors+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000daf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 11148 bytes
SHA-256: 9b9c777ee289c3e7807fdc2ed81333f6fe2922f34d33fb0b23243cf895eefaa4
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 17728 bytes
SHA-256: 7fd62d47e3669e1bf873ccf4533eb033bbeb51128a892953650ac62c5a3684d0

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