Malicious PDF — malware analysis report

Static analysis result for SHA-256 524633a191920bea…

MALICIOUS

PDF

84.7 KB Created: 2021-07-13 15:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c7156cd685fcd3dc25b1c73517c127b1 SHA-1: 40f1fc676ef5a17ebb781ff68da2860cf03009c1 SHA-256: 524633a191920bea643d389ba992875e1453beee700ab43811b3ef7f4d1eb1ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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 http://sllight.ru/design/img/upload/file/80869595294.pdf In PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a372b20f519---18921922925.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/88159701328.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e88b70a049---2823966755.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/bkrpb660t08f2tmdjha8csm852/podigosemunurize.pdfIn PDF document text
    • http://lhsclassof1971.com/clients/74120/File/3021126733.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/g20pv5qc3s01uki6ajgt6djqie/nopeferuk.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608315b40c2a9---37220144263.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/givixezadiwisa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bed1fa8561---golokozelifakitugejol.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/zorakisorawuvawotekopi.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160beb9857e9eb---17545947063.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd8f495253---37521060255.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160940d3fbdc3a---92728662511.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/rurekagasajosotojejowuwu.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/ce6k0h5btc2gk3i3j6fpob95sf/99159493202.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86485f18d0---87615094309.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/danak.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/pabojav.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/80955908971.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210620162423274274.pdfIn PDF document text
    • http://mega.kz/media/upload/files/vimufareduvivifapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+rolls+ohvPDF link annotation
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB07 17312 bytes
SHA-256: 60790c6cfdc2260f73efaa27263247c45d04a478c0036542dd9c5fbd0d3886e8
font_01_sfnt_off00011854.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001306a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306A 9780 bytes
SHA-256: 3a2741e19c1a705acc9a1b76c7d1cd81ac6c7d7f69a7cfcaee050084bd014eee

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