Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ea82b52d0d392da…

MALICIOUS

PDF

86.8 KB Created: 2021-07-18 11:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5b4afd430934fc13f24564cd224e34bc SHA-1: 78d52eb77eb546431007bc5a45ce97cf64d720e9 SHA-256: 0ea82b52d0d392da43faabae208c1538049208d1fc18c43f97c5244d045ab37e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The primary purpose seems to be directing users to potentially malicious content hosted on these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://pc75.net/upfiles/file/1624137398.pdf
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c38f64b21bc---tujot.pdf
    • http://aeronautike.com/userfiles/file/92728890826.pdf
    • http://93564497.com/userfiles/fezifataruvopib.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/29u5tn5r11i7f525ncgosdmfqj/62454159791.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0bac95b8c370b27f72bf9084b06eb91f/wegiralafov.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/6495b0cb0e4a5a846b63694795d54254/68986662226.pdf
    • https://allianztc.ro/files/file/28358282547.pdf
    • http://seventyfirstclassof69.com/clients/60772/File/lukusiraj.pdf
    • http://biswasi.com/userfiles/files/pudizize.pdf
    • http://midel.me/userfiles/file/ruvivulezuzagegidevov.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/tizivepepezuju.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae1d454d8bf---biwekuvuwirobikusolowiwef.pdf
    • http://qca.ch/userfiles/file/72482381252.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16087f0e324601---77418231747.pdf
    • https://bandotrading.com/uploads/file/wowirumaluxatusifozu.pdf
    • https://welltowork.org/wp-content/plugins/super-forms/uploads/php/files/fa85c75c68fd039f98becca9440f48e2/91248534634.pdf
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/4b4535fdfab16b9150913a4f4ea5a306/raruf.pdf
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/89158469259.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa8f77db29---mikepejavabat.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/55230264471.pdf
    • http://ajisushionline.com/uploads/files/furesukebemanajuvus.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/024e5f4bfb40176e231660a3795334dc/76432027334.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/9a2699d5992c96108c455994dfff99d3/pefizuveropazobesikef.pdf
    • http://caopump.com/admin/userfiles/file/lerovazedujodatoze.pdf
    • http://eastcoastbiker.de/sites/default/files/file/wurek.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=two+cones+with+same+base+radius+8+cm
    • 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_off0000d572.bin
804e8bca108aefe0d3b6c1cbdd1ec67b14d1c4218d52eee22203e98f78d74dae
pdf-font-stream PDF embedded font (sfnt) at offset 0xD572 17836 bytes
font_01_sfnt_off00010488.bin
6041f22b58b27a1f7a72653e4b668527ef13956a5068415da2ba6552ac4de5b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10488 11084 bytes
font_02_sfnt_off00011e49.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E49 16792 bytes
font_03_sfnt_off0001365a.bin
450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1365A 16088 bytes