Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad98b29b53c93068…

MALICIOUS

PDF

101.2 KB Created: 2021-06-28 14:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 426d2bd2c2b08f8b1bcb1818c954fb30 SHA-1: 4b46b7259376c33fce0f340d5b2df2b4a64d7036 SHA-256: ad98b29b53c93068a2c74df2a8215709098da02337ec04b78d764d74b3a2eee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs that point to compromised WordPress installations. These URLs are likely used to host phishing pages or distribute further malware. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://wastran.ru/uplcv?utm_term=stick+with+synonym
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082c4c2cb383---malat.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2d47383c6---1556691986.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1e32449aa---bugujebunekox.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c867abc27c---79437179494.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16098481a643c1---nofonevuwutoxagusev.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d48c8ad9669---52489958832.pdf
    • http://www.advokat.com/app/webroot/img/fck/file/notif.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160916a5445e1f---lisovaw.pdf
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/58108763978.pdf
    • http://architects-desk.com/uploadsfile/75893238347.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6419a1f4a1---bumafuretetunis.pdf
    • http://xdata.pl/app/webroot/img/ckf/files/jufumisewanixeforo.pdf
    • http://nenkin-t.com/upload_img/ck/files/87078970429.pdf
    • http://henrycrawfordreunion.com/clients/1/19/1929e20d1ffebcad6d8b2a659e9c170d/File/nezoworowo.pdf
    • https://eitmedu.in/ckfinder/userfiles/files/17997759868.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cf6306a77---17558803496.pdf
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6f2f195fb92e73b6f3e0430c933b9418/wadut.pdf
    • https://vieclambanhang247.com/upload/files/dopesidosajak.pdf
    • https://ncsccalgary.com/userfiles/files/7780098798.pdf
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/7ide8tgbuvol1ot5uk8ramtfa4/voguzibizonozomujaxa.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/8397b6efc6141bde560f4c4685b47ee7/10041054776.pdf
    • https://digitaldaya.com/imagenes/file/72110781336.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc6b.bin
d8cc18cf2269775db66f47f2bf104524822bc97ae580c77c140b1092d43ae50f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6B 16796 bytes
font_01_sfnt_off00011489.bin
75234e3c480beebd3582cd7edebeba75828883518e6bdf258b30a9a148dda1c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 2644 bytes
font_02_sfnt_off00011fd6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD6 16792 bytes
font_03_sfnt_off000137e8.bin
b2062539e2890a1d88c7d3c26055b195126cd948bd6a480c1c3029a274de5f34
pdf-font-stream PDF embedded font (sfnt) at offset 0x137E8 21400 bytes
font_04_sfnt_off00016dca.bin
9d5d954f6df2fcb3f8f25999dab2ab03fe6bd08fcf2aec9d716f5b23873daa27
pdf-font-stream PDF embedded font (sfnt) at offset 0x16DCA 10424 bytes