Malicious PDF — malware analysis report

Static analysis result for SHA-256 609ff5d7e0d58725…

MALICIOUS

PDF

82.9 KB Created: 2021-10-05 13:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b0297e35c39ac9737c33b31306423f9 SHA-1: 740e3beadeb9a7ae1f6179c9c55a09fdc926a78f SHA-256: 609ff5d7e0d58725f9d10afaf85895acbbd0a18de51fe93f03b8487e82913bcd
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites to host or link to malicious content, likely for SEO poisoning or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://chcial.ru/uplcv?utm_term=solutions+intermediate+2nd+edition+student+book+answer+key PDF link annotation
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/37120141140.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/lamupumiwimumesunedevoju.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/58241137900.pdfIn PDF document text
    • http://akifkasaboglu.com/esatfisek/images_upload/files/80474755899.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/12610727904.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/67722153041.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/borunavofovadas.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/jonezixab.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/df91c46bbf48f8739e2101994df67736/1585909951.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/41417126861.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/wuvumebikegodijudexugogup.pdfIn PDF document text
    • http://world-housing.jp/ckfinder/userfiles/files/43144914424.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/xivakutawuxusepuwoboriw.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/vifujuwale.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/90738775629.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed43547624---82042687808.pdfIn PDF document text
    • http://tcihk.com/userfiles/rabujikinugezeki.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613720197e89b---3506879802.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/gewetezojipu.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/322838524.pdfIn PDF document text
    • https://fotografski-studio.kost.si/userfiles/file/sawavosisanojegip.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/pevovotazulosovo.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/gijaxesetosuxo.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d64cdac769186afcf21ccf1cfbbbe2c5/junalewerogo.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_off0000d5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEB 11136 bytes
SHA-256: 5eb7d50921bf292be78878e5c5a10de2c12d689e1b11821c8c7632b541ccda19
font_02_sfnt_off00010808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10808 20724 bytes
SHA-256: 9c4c020b5cfabc724616f941a7c4397a9a66f9821f3acc353fa371f3be6493b5

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