Malicious PDF — malware analysis report

Static analysis result for SHA-256 d69134f74c48bb4b…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 02:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21bdd0baa1de7a8b759e61d4f84c39d1 SHA-1: 37f099f55912ada4f10d0cc94114fb6a959cde6e SHA-256: d69134f74c48bb4bfe72d16f13a156fa65b5a8329da665467eae299772743151
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to various PDF files hosted on compromised WordPress sites and other disposable domains, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/47cc28bc00edaa28763c7747d4f2db94/93941441768.pdf In PDF document text
    • https://ochronaskory.pl/pliki_user/File/99505532290.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/65930648752.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/gatukox.pdfIn PDF document text
    • https://dnm.tw/uploads/files/202109081628545632.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0193671f7---tetokuzotexosojexarub.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/gazurosemasafivubeduremul.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/36223584641.pdfIn PDF document text
    • https://sinarwaja.com/account/files/fokopofoxujofugu.pdfIn PDF document text
    • http://hotelbelleepoque.bg/userfiles/file/45494040077.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/wimuzivinas.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbd8e68c49---43553798510.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aab1c73636---46520907290.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/8484349462.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/misivudelifunoxiwebos.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/wigiguzowofugosefarurod.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/66278704049.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161396f733ac8a---69700854464.pdfIn PDF document text
    • http://gajagotour.com/UserFiles/file/9341079289.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/51256515977.pdfIn PDF document text
    • http://sb-78.ru/files/file/tojajuwiwikem.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/7326592749.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/35961463996.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/bepugitofizobavumogixamof.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/filironobubonojewutojabak.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/38526940551.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=root+pixel+3+android+10PDF 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_off0000d9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AA 10708 bytes
SHA-256: 9bb46345af3b05ca62e3dd54e90b827e94a0194a2a1057450329f801bc02b586
font_01_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A79 17192 bytes
SHA-256: bb86b459bc53e35a3d2a643232e7fd28becfac62b4e013f8ecab8f19a20812ba

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