Malicious PDF — malware analysis report

Static analysis result for SHA-256 521a678234809c6c…

MALICIOUS

PDF

110.1 KB Created: 2021-07-04 06:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbd9ede82ed9f00414186f10038368f6 SHA-1: 8cded489cfe4996a639cd1811923386d8400725a SHA-256: 521a678234809c6c1168d7a37f9d3c38c897e3b304baecee0225c1333ae7e7fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/bfa6bb09a23bba6eb99d901b76de2fb0/lusidukeduvuxekoxusarured.pdf
    • https://diarch.in/WYSIWYGImage/file/falizaposoluxofipazebidis.pdf
    • http://megaeventoa100.com/clients/f/fa/fa03970f5feff24be7017758158681b9/File/12683366491.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092cd3634d1f---37524527689.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886a43b4c91---gagudazanagutenu.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089419663303---64525345872.pdf
    • https://eingangrad.ch/userfiles/files/60495183940.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160dc99443d6d9---mebujawolenig.pdf
    • https://kontiko.com/ktkweb3/images/upload/files/fesezebiwajeneroguxeje.pdf
    • https://soechi.net/userfiles/file/47960015815.pdf
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/5gnvd96qd4r8fe4os8r64up87t/kifoseri.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff0797c92---90527784040.pdf
    • https://apskarota.org/userfiles/file/58349982477.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a60d5582cd5---noreguvozajobelaxukod.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5015be75d7c6eef49705055e70f78b6c/92670670874.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4f56e4b21---fefidulemu.pdf
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fa35a99863830b61a5fd00faff814e3c/37180020438.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/5s0lou75atjdnhk278biht7vj6/kurapubuti.pdf
    • https://aawyx.com/sites/default/imageuser/file/82758941202.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7610a6e7e8---81054324399.pdf
    • http://aucoindeshalles.fr/menu/file/zovojodi.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/32a24e639dddde7fe1fe670919a4bb61/60404032607.pdf
    • http://bensonlandscape.com/editorData/file/6046220727.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609884a5821fa---77176049950.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=diverticulitis+symptoms+right+side+pain
    • 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_off00014794.bin
88174f3fa7889514f1d0d9d03efaac099c5186b35da1c106bc704ee78dd12a1b
pdf-font-stream PDF embedded font (sfnt) at offset 0x14794 18204 bytes
font_01_sfnt_off0001771a.bin
2d369c0804b3618943f7b72e9ef2c140ba140d5f96e09030f4f8c92396209c08
pdf-font-stream PDF embedded font (sfnt) at offset 0x1771A 11240 bytes
font_02_sfnt_off0001912a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1912A 16792 bytes