Malicious PDF — malware analysis report

Static analysis result for SHA-256 50f6b66eb0600eaf…

MALICIOUS

PDF

95.6 KB Created: 2021-06-28 18:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ea5939d0e29c59bc528e7b4f74be5aa1 SHA-1: 994c84a13b26a94714e0610c083df0fae1c3ffa0 SHA-256: 50f6b66eb0600eaf8f38f0ed9c4a5780b12bd91876a12443d1ef03ea2f087d89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farms on disposable hosting indicates an attempt to obscure the true malicious destination. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/36c5b3e72f8227aadf969aca27bed86e/zujajadilozanup.pdf
    • http://fautographie.org/images/userfiles/files/67727727473.pdf
    • http://bienbao.net/uploads/files/davabona.pdf
    • http://akkoryazilim.com/userfiles/file/35785513249.pdf
    • http://alhouti.com/userfiles/file/nasomolowin.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/b515sroerfkpl84tf37dpav7e3/66294668735.pdf
    • https://kimtuong.vn/isc/public/files/fckupload/file/7714246773.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/xugabiwujizejiz.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b636cb74281---14115286731.pdf
    • http://edu-family72.ru/content/images/uploads/file/35218863903.pdf
    • https://livre-art.com/ckfinder/userfiles/files/4287857253.pdf
    • https://dafelia.com/files/gediwopojelezixomo.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160982a691c5e9---juzog.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/7703278106.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/m9q756s6rasfdku3p78hd4buaa/fijokujat.pdf
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/c8e3e4e381d3dee1247d9a9d1320e99a/92787415468.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608106f51f44d---marezemo.pdf
    • http://kbchina.de/upload/nukuxadaminobevofanim.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/48c6c3fb1e3b3facc548dd351015ccfa/zoperafupag.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607971e5e194b---dasux.pdf
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d601e3027---4968311165.pdf
    • https://acgroupenterprise.com/userfiles/file/13547517613.pdf
    • https://ketdoanbus.com/webroot/img/files/34860842987.pdf
    • http://nsdadventist.org/FCKData/file/zuturi.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729e250df56---24135668779.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f312f3bb04---figomivaril.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dynamic+iphone+11+wallpaper
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc88.bin
fb61b69a8b0ddcb8567dd042707f7b35dc31b981581c25b00adc742404e38f3d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC88 17340 bytes
font_01_sfnt_off000129ce.bin
70538fb74d4c2cd6a405465e193156724b3ce86d389784802b164dcad1a2fd6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x129CE 10624 bytes
font_02_sfnt_off000141fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141FB 16792 bytes
font_03_sfnt_off00015a0c.bin
47026dccf2751b9ba68591340fbc2cf18ad945e4f35ce0d6e81af5ccdb124235
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A0C 16524 bytes