Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8163189a70f7e3b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-21 18:08:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b0f1be2d4bea4110e586f98d247f0f05 SHA-1: cfd4eec3bcb5d889e6b3658a58109d39e4c798ae SHA-256: c8163189a70f7e3b5d4dbab381a1c01b551915275200ddb6fb96027decd30c61
204 Risk Score

Malware Insights

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

This PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites acting as link farms. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly suggests the document's purpose is to trick the user into believing there are new payment instructions, a common tactic in business email compromise. The ML classifier and ClamAV detection further support its malicious nature, likely serving as a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/6fcf7e72dca2ffe56612e1aa947d3f6a/41896814888.pdf In PDF document text
    • http://tokyoto.pl/UserFiles/file/11190190391.pdfIn PDF document text
    • https://emenu.hu/editor_up/24246901838.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/96531431977.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/jokonigojogupikupituxelox.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149196dda6d2---wodopuf.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438b014abe6---xupudoluzuwutuv.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/zuguwirobujelusemuri.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/giwojeju.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/ab921702ac72dc8ad7b2cb819e77ef4f/jafukazaluwijetizaxalizi.pdfIn PDF document text
    • https://profitaler.com/UserFiles/file/visikejalutevonowizanuwi.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/28907422094.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pikewugi.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/nebuzutozosazep.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/80062999791.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/51538310310.pdfIn PDF document text
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/80869509300.pdfIn PDF document text
    • http://etyekilovarda.hu/userfiles/file/jebevexejo.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/21032327245.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/35178560891.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16147cbda53c92---73531861268.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/36499611496.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/70319210574.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/vavajuvajuwasamutudow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=public+bus+transport+mod+apkPDF 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_off0000da05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA05 10876 bytes
SHA-256: 07022f4fb38f882573aa05d8c08bd8325ba7013f9c2ba84038885611e33f7431
font_01_sfnt_off0000f2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E4 17704 bytes
SHA-256: e6bce09106900a938fa83fd8151cc9f35e3bfa206b2b6bd68097c1dfe3d85b2e
font_02_sfnt_off00012136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12136 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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