Malicious PDF — malware analysis report

Static analysis result for SHA-256 d01e6fcf92f24603…

MALICIOUS

PDF

78.8 KB Created: 2021-09-07 02:56:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 072613d9f83c961d1fd81dd7e2b0712e SHA-1: 7d2f72a8f303504993e0ee2bbeb72fe9fc84c7b6 SHA-256: d01e6fcf92f24603eb6a9799794fa90d1f47fed3e096b4607eefb335b08bec71
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, hosting numerous URLs that point to other PDF files, many of which are located on compromised WordPress sites. This suggests an attempt to lure users into downloading further malicious content through a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://pekbdt.com/filespath/files/20210805214211.pdf In PDF document text
    • http://vieclamquantri.net/upload/files/675682848.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608628e6e93fc---mopizekoka.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/0a94d0009c7aac09da95828f2bb119b0/20750067542.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/9gtfs2ntm497a020gk28gnfc82/41442472055.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/rafis.pdfIn PDF document text
    • http://midel.me/userfiles/file/sidudanonezawufebupilage.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/67738609665.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/8e1bf1dfe57a35556008dbb50a6f3e89/rubufo.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/feboju.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16080c27c6fd37---gojapabovisotaj.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/nolekoralunesobubofaxerab.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/waponijadonufibibex.pdfIn PDF document text
    • http://tuderprogettazione.it/userfiles/files/losotigukelipadaruzorej.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/vozesukabuxipijev.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/43151577218.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/93609191770.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/2600088025.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083108cae0ea---fopat.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/68998078323.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8f6f0ab841---zexumoberimubegin.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/kdgmfkvqk8l4m4gdjn2qcgj7c5/23358571853.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/mijumuvipuverajadalebones.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=acorn+180+stairlift+manualPDF 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_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 17676 bytes
SHA-256: 4028dd038610358311cc6a2990295063f2dc16146aa7f061fcd522de5407287c
font_01_sfnt_off0000fcaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAF 10828 bytes
SHA-256: a2699671d2094becb9e61bb436f9ba6b0cf99ae9ad6eec278a9d5ff715e1c519
font_02_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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