Malicious PDF — malware analysis report

Static analysis result for SHA-256 70389867feb543bf…

MALICIOUS

PDF

79.5 KB Created: 2021-06-21 19:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 779e05976f58802e0546b8210c2d6c9b SHA-1: 071c117ad933f8e8caa06d23114075b519b5c453 SHA-256: 70389867feb543bfaf2cbf31fff33fb5978745e56ce4cd0d75ee1f27208513a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites that appear to be compromised WordPress installations. These links are likely intended to lure users to phishing sites or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://archism.ru/uplcv?utm_term=warble+of+a+smitten+knight PDF link annotation
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/80466c0903d43e5c9e8cb1fd80de7ac6/luvotiniwi.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/dusitoxevixezafimu.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f73255abab---zewuke.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8b098183e033b3ac5fb4cb691034a48a/sivodamu.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/bokosalubutavarares.pdfIn PDF document text
    • http://df-2.de/images/daten/file/zujuw.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/46541624576.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/69866521225.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/voniduj.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079db19bd6ed---23334622887.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/xisuvuvuraxelodipirip.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/9b6b85810172c744c25aa96553415bac/51314623200.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/mtc7c2tjr1gtobiu3giameabe2/pupegabiwezadupe.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/54211185698.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/cf661c4c9546e14eb6475d930b9c67b9/90144373685.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 5400 bytes
SHA-256: 2704f0880345f28062f8b3abdfcf86fad7e6907f70dc8e3d0f990d8521139726
font_01_sfnt_off00010c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C40 10856 bytes
SHA-256: e9db98d9758c1c1089c8d294f39a04ec7ad74857f26049faafa8ce9298f5ef76

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