Malicious PDF — malware analysis report

Static analysis result for SHA-256 4104f16a69b4d08c…

MALICIOUS

PDF

86.8 KB Created: 2021-09-04 03:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 037a16ea2ac3dffe7cdbb6a532766a75 SHA-1: 98dde8d5e22ba9e1b7b8f26bbd89f2f4cc97e9c0 SHA-256: 4104f16a69b4d08c3bfbd85a03e5e1a909c9ec5d299501dbdf0e539893ec3b3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. 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 0.9976

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://krisoc.ru/uplcv?utm_term=cardiomegalia+definicion+pdf PDF link annotation
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607364810e3c5---gevenifepunitiluxi.pdfIn PDF document text
    • http://liyangah.com/Upload/file/ruledaxiradaxogidi.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/53235505919.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/delufusolozoribokoped.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab84acacb5c---dazaninudonawakujofewef.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/6a8ff16ca436ca022b7b0d6be490338e/81617664166.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/78900717503.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d7eb39551---butog.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/86883512685.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/vazedanepufebizisumiwid.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/ritegevud.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/56190461370.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/25681126564.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/gejexub.pdfIn PDF document text
    • https://dineflon.com//files/kilorupifafupewafuratilor.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/7ac16c73057d7cefd8e8797929fa55ae/fodof.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/sajuwaxexivafevusezopof.pdfIn PDF document text
    • http://ipllaser.in/uploads/16715698583.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/rifegagapuzerupuf.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608212375b20f---jirelite.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160837eea23d12---49202972293.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/86530346176.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/90072229972.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051A 10728 bytes
SHA-256: 2e144868c77be572c6a4f312bbac8621143f593ac9e82a8ca913d9b3c6efee46
font_02_sfnt_off00011d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 18628 bytes
SHA-256: af291b09271b4734785cf987686fa6b33e2781f628c2becdc395222c82f28576

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