Malicious PDF — malware analysis report

Static analysis result for SHA-256 b19aaa0d09d85600…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 05:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: b5bbf287d74c95d5873c960613404003 SHA-1: e83e9db3fe2e59cca162d267672fd713702b99a0 SHA-256: b19aaa0d09d856004335e9fbb8c12630a26e5051da32205609c1ddfd1b9525fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

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 https://medvor.ru/uplcv?utm_term=most+popular+theme+for+android PDF link annotation
    • https://nada70.org/userfiles/file/73918565785.pdfIn PDF document text
    • https://nutrishop.in/ci/userfiles/files/74173854124.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/78553319080.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/pobotivonik.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/zowopatilotomalawi.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/86280491870.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613147947749f---28954235661.pdfIn PDF document text
    • https://spacio.hk/attachment/file/72557258772.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135035ed7c6e---67423322892.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/tobukimiwij.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/zipovitezetiwate.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/8f20fe7695478f0f5160900611c8d7ee/nefewidajujezita.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lawevuzujigolej.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2f6aa3710---78732649390.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/mupigun.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/dagimokoramese.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/48027331629.pdfIn PDF document text
    • http://mobiliteit.nu/files/91599278823.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090904093210.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/56457412286.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/joruk.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1lge56jivic86641bgdl9j0g20/15112551479.pdfIn PDF document text
    • http://surtek.biz/image/files/20150330_085545.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/66501147598.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/6148472473.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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 10856 bytes
SHA-256: a924880a42acc3db65f29548285337d005ef43402f22099ab3821589b9c74b58
font_01_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 18132 bytes
SHA-256: bc83b48236c2da17c6f8cea277f9b8c40356c3006ae426961b9f7535886d2057
font_02_sfnt_off00012283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12283 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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