Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e2df4efbf7ce816…

MALICIOUS

PDF

99.9 KB Created: 2021-07-07 07:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 425935d69aa9eef8e66d874b1738e2a3 SHA-1: 21fa0c280ce48ebc323523c647b42f7f842bc859 SHA-256: 6e2df4efbf7ce8167c762f4e0f177e5164384a207666d3a034b3959f8c2c9138
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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=now+hear+this+haydn
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b538550c6---29063681026.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/b32e3b91b4601a1b9eec4e3fd4e91e57/lapavek.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccd7580d0e---91597788647.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/881b29478bcaf858d1c2f8a66ddd2125/63677873837.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7fb006df0af8e70800b52ad4f00f088d/zerarovulusuvimikuxuzoz.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084c4e59be0b---wutujireredudazarilozene.pdf
    • http://castel.lu/userfiles/files/50446651561.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1c20af7e1d0c3b71d12c308ed1fe5715/sofazojev.pdf
    • https://drivetripper.com/userfiles2020/files/kiboluzazawipivovuxegip.pdf
    • http://fixafilm.se/userfiles/file/muxesozeganiwoba.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/2a157ccc26d7e0a2a6333c606d824804/81821853459.pdf
    • https://istocdukkan.com/userfiles/files/31343331270.pdf
    • https://rmp-familienanzeigen.de/cms/files/60471350094.pdf
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b020b72e723---rudanikovokodibufo.pdf
    • http://kookwarenhuis.nl/app/webroot/files/userfiles/files/golopufum.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/54db2d0426d50b48f1fcc57e3e960d9b/wiziberugirafeda.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/99ef45402f830500471407242d25a7b5/30756771877.pdf
    • http://ibtaker.ps/userfiles/file/zuvuzokegotututariba.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e5556f6e55e10addf3fabd96149ddf53/zewotobilajuroxire.pdf
    • http://ferramentabelleggia.it/public/file/paronoto.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f9fe2d8068aeff5fb924357091fe6fc3/nasatikudufanajefapixe.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160814f840ceeb---nexarizal.pdf
    • http://pcccmiennam.com/media/ftp/file/4943121991.pdf
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/817c0491555c962b622399225f5a977a/wotenulotutobogutepiman.pdf
    • http://transbur.ru/admin/ckfinder/userfiles/files/56607475728.pdf
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9dc48d3e0---zunetokixesolawilekewa.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_off000125e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x125E4 16792 bytes
font_01_sfnt_off00013dfb.bin
f37c58aa355e6f2f0529e31668dcf3b048dcad730d57ae0955efd3ce6839fee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFB 10476 bytes
font_02_sfnt_off000155cf.bin
62d3ecebf01cc95b4076c9d36f6b78c66aa0688b641a21ddd010302022edcad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155CF 16696 bytes

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