Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4668fb1c2abae99…

MALICIOUS

PDF

85.8 KB Created: 2021-06-27 15:00:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c15a589a83effbed8023692e43f6f6c SHA-1: d405187bc0a57c2744f5ad3c3dfe8ae63715424b SHA-256: c4668fb1c2abae99723ad640c6eb114c394a0daa5811192b10e866f18ec05f35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to potentially compromised websites, identified by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/f2c79c13983447d6b2dc57accce2afcb/44387787858.pdf
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/qvi70dcdpb37oodavmjcgkj8r2/62872437251.pdf
    • http://happy-travel089.com/CKEdit/upload/files/56480492484.pdf
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb4ae2611c---pizurezudaxofa.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1960bdf0e---wosugamemeratemuwax.pdf
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/187e9877e8e92d7ba3a82df0320975de/bulivop.pdf
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/0a6c15bf6fc218c29895f970bcbe99b4/27710844381.pdf
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/l6ne3ublhma0ks5pajkdej8lnh/sifuxelapusapunubesibijif.pdf
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/3bd8c02343d986ff71b39ee729d6785e/borunudetabefisupuziwebe.pdf
    • https://airflow-skateboards.com/upload/file/8726868573.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/1d82b7547c41ea8c2259b9ac3b057119/vuxilo.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795ce909236---ravenuvibimaj.pdf
    • https://topplene.com/upload/ckfinder_temp/files/20210620150325.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8135b2bb6---tosumiguwusu.pdf
    • https://alexandrapanayotou.com/web/images/static/file/piratetatezaso.pdf
    • https://daulte.ch/ckfinder/userfiles/files/12848162048.pdf
    • https://aymsoft.us/aym_image/files/nepudufamevuw.pdf
    • http://mulroyenvironmental.ie/userfiles/file/18917105397.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/0eef7974f5e400e517d95b941b463d93/xawemefaf.pdf
    • http://asfalon.com/__files/file/86716140455.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f542584a3f---xofojevatekamer.pdf
    • http://3colorjazz.com/fckeditor/userfiles/image/76092657489.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dynamic+and+stative+verbs+exercises+with+answers
    • 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_off0000ea59.bin
a719a5ccbd93770fb1a724c010d9bb15cf69bf71938281b0117e11174d156e46
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA59 10976 bytes
font_01_sfnt_off000103c3.bin
7d97df327bb2af9f669d56cc139db63d4ad651ce3d2e40b925d3c00175d37987
pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 18000 bytes
font_02_sfnt_off000131f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x131F9 16792 bytes