Malicious PDF — malware analysis report

Static analysis result for SHA-256 682a4410dbcd45a6…

MALICIOUS

PDF

82.3 KB Created: 2021-06-27 06:33:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6857f60246c3adad74f7ae961528e339 SHA-1: 726a7e5b1b833582f2c2f64debdb43392bd8d5a1 SHA-256: 682a4410dbcd45a6f36b1e8c4be7b3f9c529aa3a240f9cd6556f3e810bf7642d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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=name+the+stages+of+mitosis
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/6a8207c823ce3fb86dbdbbd9db6d8d3c/bujusawolulevawafefibaj.pdf
    • http://hotechike.com/files/files/85000650939.pdf
    • http://www.gabrielamaciel.net/images/content/file/fagosudoref.pdf
    • https://cplastik.cz/data/cms/file/molifejodopokefigom.pdf
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0958726a0---goruwidikasaw.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/xolazegis.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/a385dc55936b774c949b675faa50f329/vedipofivuninuxuruguxupu.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/011af73b8911766c2026aecf733c4bdd/revupejegalobazusafifosuv.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/96099534417.pdf
    • http://zekidilektekstil.com/images_upload/files/82751608327.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/kikusilevasapedoruniduxi.pdf
    • http://www.manorbymajor.com/userfiles/files/seruzegaguzujamulix.pdf
    • https://bangprice.combangprice.com/beta/cms_image/file/xezukunepuxuxibabejo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e268.bin
44e3c745e509994c57f7493cbe1708af225f82adee5c7a36c14331bf7ee67175		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE268 16500 bytes
font_01_sfnt_off00010d3f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3F 16792 bytes
font_02_sfnt_off00012556.bin
20be432f80904e453cdcadcf339825a58de5b9239106ba24a5b0b6169c518b44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12556 10388 bytes

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