Malicious PDF — malware analysis report

Static analysis result for SHA-256 b75443ebeeaa6e93…

MALICIOUS

PDF

79.3 KB Created: 2021-09-08 11:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c57fa1ef3f7b8ce53ac37e2dab24948 SHA-1: 48bc93b2887f25b2bca21b083946c711fa635149 SHA-256: b75443ebeeaa6e93c3d9aad20156e0bb5e44199afc9150ccddd59baf3ca44515
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to external resources, many of which are hosted on potentially compromised or disposable domains. The primary purpose appears to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/af3fc5fc31d317ba9e5188a94696412a/lajasomimetepovudugus.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4c22727ba---rexuburatarikugatomene.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/28481881853.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/xofuputakidikevinubekexuj.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/futawevaga.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/befosimifepopawabagi.pdfIn PDF document text
    • https://ksmt.edu.np/assets/ckfinder/userfiles/files/dewosid.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b17ff811cf8---kejim.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/29496412808.pdfIn PDF document text
    • http://hidropro.hu/upload/roled.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/22221766819.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/46aeaea2ef933b6630d20d96d915f00f/mezinulena.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/81196172528.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/fm5ceg6jkig7rgroq0bglma006/87076501796.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/likinebuwab.pdfIn PDF document text
    • https://fokusmedia.com/images/uploads/27346758932.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/kotunepawoxopadotu.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a6211697dca---lasovidugikuvugipukasuw.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925a51689be---saparatofuwizaketererog.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/pujobegixunuvutiletukom.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/76428547648.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/72175066921.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/36875256632.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=understanding+geologic+time+geologic+time+activity+worksheet+answersPDF 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_off0000d046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD046 17384 bytes
SHA-256: d39fde122526f6706aee6c1d76fe7986dcd284e97166d49ed2dd0bb1d9324b2a
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 11180 bytes
SHA-256: 437ab741d4c99de40a51ce4fb37dd84c909d225d9abf18818e83d8fba0b9221b

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