Malicious PDF — malware analysis report

Static analysis result for SHA-256 87abc3b0da459af9…

MALICIOUS

PDF

69.4 KB Created: 2021-09-13 01:47:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 28d8b4fcc389f202c253496e79f760c9 SHA-1: bffcf6dfcd766be36a9578c13d5c966ca5a3abc8 SHA-256: 87abc3b0da459af9827d601d16f8d95d464156309f4aa99e9a52203c11da7239
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and link distribution align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://masan315.net/board/imagefile/file/532845777.pdf In PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/ratonudofafibaselibajoda.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210909_AA2E9C61317D362D.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16134d5d5b1bb8---neneragozawovabitajuvapev.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdac43b308---wololivoro.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c54ec96c06---lamaxutulezuwifoweko.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/23648870604.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/pepozitoruwitafijuko.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302e5306233---lipedivuwavomilatuto.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/99a3ec50c0319115096d8da709de69c4/40816269291.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/valozaxo.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/gujupufuguvisujenofoso.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/korinoxutabolitalog.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/46546092730.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/sefibegatimogavu.pdfIn PDF document text
    • https://nistd.in/userfiles/file/43090569575.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/jesijakevozutirogojemog.pdfIn PDF document text
    • http://jarosi.hu/files/file/paxomoselukixajiso.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/difapaf.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/39625697638.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf07b5ce0---26968626665.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/38106985694.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///gunoxokexonovumokudikufuv.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/54379588326.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=mynet+android+appPDF 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_off0000b185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB185 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC997 15548 bytes
SHA-256: 0641643c7d5b0c37e5ffe432e38d2767e889699c8cd2c31ec4d89c70ead4329e
font_02_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10276 bytes
SHA-256: d61912fc5782f4d66ba50e169d7aecba1608ddcf40e09c67c7c3d100d6bd2603

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