Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee57d976294ab61…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 03:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 546885b78be23b25f7b2887af8fd358c SHA-1: 505b4de90b1074672ad69a17e7b61c1d456a0639 SHA-256: 6ee57d976294ab614e5c4cfd9638a227e20645f99397a3da9f1135dfd3f8d7f9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to download software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://infrive.ru/uplcv?utm_term=happymod+pc+download+windows+10 PDF link annotation
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb95ee0797---98834248737.pdfIn PDF document text
    • https://12tiga.com/contents/files/betekalud.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/daxovor.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/3dk785d0uk2t277o7sibkd2cu7/gifeboravovusibus.pdfIn PDF document text
    • https://petikdaun.com/contents/files/vufiduzibilowazafusuzipu.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/33206691547.pdfIn PDF document text
    • https://soechi.net/userfiles/file/51840355075.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/wilunomejotovefufedot.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6cfaafbb72935d61558c84b1f1db2409/turekimuxodadesikilawoda.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/62299151941.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/61355646080.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/81009931141.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323002d6620---divet.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/dogasi.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/tilupivuzodubajazaz.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/67412289463.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/sixexativinudumevenevuz.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146886d5e9d3---13949513751.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d34d1a3a1---wukoj.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/fixukabidu.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/655566326614d6862bfad3.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448acd5f932---pavoxuxinipifodisewe.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/piratudikegolu.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_off0000b2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2D3 15744 bytes
SHA-256: 950145634cfe4fff688e488b74a0c7abbf14ac40c801d50124bbb8f01779ee08
font_01_sfnt_off0000dab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB1 10708 bytes
SHA-256: bf5383c2ffe15ddedb828a07002a4b08953aa251cc01a3b9c7ceac69c64f7dda
font_02_sfnt_off0000f340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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