Malicious PDF — malware analysis report

Static analysis result for SHA-256 11741794f8377b80…

MALICIOUS

PDF

89.3 KB Created: 2021-08-16 07:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c257f40b725f394ed64ef529255a8518 SHA-1: 314c7a4ea5fae003f436b89f471c2347a4bb703a SHA-256: 11741794f8377b80d688759f7f5cacf7456e0ce8857b0504efe29b0dfbaa532f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan distribution intent. No scripts were extracted, but the structure and URL patterns are consistent with spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=smart+hrm+bracelet+user+guide+italiano PDF link annotation
    • https://chennothinterios.com/uploads/file/dijarubuzizinuvukesezi.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/kuwogaruxad.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a00344ee784---ziregasidudavake.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/q64ini9i47ur1m9h530407741f/joluvudirakubub.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/66213927169.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/busetoxosuveguminunowid.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/29523872239.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/682gi3r6i5vsv9c1hrd0lv5t61/rumig.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/17521286306.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/owudijirivodizukavufub.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/maniranavalarosovepezo.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16091ef5b3ef0b---66521705905.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/42494608097.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/kirotomumoniwigexatelaxu.pdfIn PDF document text
    • http://canvangdientu.com/images/file/latavefazusajinadimu.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/87731929872.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160945087e5fe4---kapedegij.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2e925262---govejeralaxuwabumok.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/35598413655.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/botakesexuvotativoxewagod.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160939f7eb1591---guboxademafifidarebojun.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/widapunawonepukeves.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/2b9372bd0e9f41c9e343e17ec23f0220/190357152.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 17528 bytes
SHA-256: e2d06dc39019c4de8f09acec8a83ce44e4ccb012288a46804dc25af3be5a8f20
font_01_sfnt_off00011c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13448 1728 bytes
SHA-256: 81f277ff9ca9cd818deb606bd01635905cfcc4a95b7bb16f78738b4b14071178
font_03_sfnt_off00013c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C83 11132 bytes
SHA-256: 89f60b1ca8d559501a53f05768ee530a9f6370692dd94792a7f2c260f6da733a

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