Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4f0e913c2eaf81…

MALICIOUS

PDF

88.1 KB Created: 2021-06-30 00:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0b5c1a068c24fa237f843893cb1a17c3 SHA-1: d0a4bd6c7bfbc9fe3aac526e02a4a7e18750cf2c SHA-256: 9e4f0e913c2eaf811240d9e0bb33088485a63e30c6cc6fb6224da84a14933a4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on compromised hosting suggests an attempt to distribute malicious content or redirect users to phishing sites, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/eb43a68bd810c2a589deced8ddb1240a/jedinelevanemepipilip.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/ff4gh0g0vcsot5td82uiun2srs/14999667702.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/46792515757.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/bovikorulolizegetulomew.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4fe8699d3---wijixuzusenip.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/7578244327.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/pk00f4svg4m34elqm2bc0ps8ju/rutarutesizevago.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a10b4405e4b---nasekikav.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3b23b5e7ca5ca001a7b2b9b82cb72706/rutevumikifuvaletepil.pdfIn PDF document text
    • https://maturana.cl/upload/file/88207621777.pdfIn PDF document text
    • https://pellevah.com/upload/files/77051119441.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/9132031882.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086e35fa3c3d---mamifasozefeposixovego.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71c17ee5b---duwekezizuxugedob.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/80936735648.pdfIn PDF document text
    • https://khabul.mn/mmpa/userfiles/files/kafalizowa.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a545e514f887c81ac5c82c7666d3da13/soluxexisusavorurojojuva.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbac58634f---xixunolan.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/d7tcfacma22p3slthq5ljkcb25/35397280890.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/8f6d8e72c24a936d6f9dd382b088d8a3/fiwixaju.pdfIn PDF document text
    • http://turexpert.md/userfiles/images/file/3181085693.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ca4ab48e41b---xevekadivilokofoninejomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=history+of+crusades+podcastPDF 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_off0000f6d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D7 16908 bytes
SHA-256: 86e93e1929573f4197ec2452f6b05879544a59eaf4e79bc24b2a613d8f3f7786
font_01_sfnt_off00012292.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12292 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA9 10668 bytes
SHA-256: 5a191af6a256b6cf9761d30079cf6c281e5a54100a6a463329d40c4e0aaf3b3e

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