Malicious PDF — malware analysis report

Static analysis result for SHA-256 462fb8b9263da874…

MALICIOUS

PDF

81.3 KB Created: 2021-09-15 05:25:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8f9526a6a8767e1d503801f3f9c819eb SHA-1: fc7029a6f692a678ac084c90e0ed1b10f3c34583 SHA-256: 462fb8b9263da874a1c1da026aca866a45bba130776e3a4453e650aedd8704a4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. ClamAV detected this file as a phishing trojan, and the ML classifier also flagged it as malicious. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cructi.ru/uplcv?utm_term=hentai+box+apk PDF link annotation
    • http://baracenter.be/userfiles/file/modugibikipakubevitixed.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/64692142070.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/sojezame.pdfIn PDF document text
    • http://recviem.ru/img/upload/34426744865.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tjdi7c1lp33a84l1js5j5o62d3/ximabulimiwusajoleropekaz.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/62832571747.pdfIn PDF document text
    • http://purepoem.com/resource/docContentImg/file/2021-09-01/92d449b50eaca95dc8569c2f7984f943.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/59752804855.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/7982437781.pdfIn PDF document text
    • http://zhymwz.com/upfile/file/kerola.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/37344546590.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/42048445577.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/23435631055.pdfIn PDF document text
    • http://www.biogreeno.com/cms/ckfinder/userfiles/files/79596652486.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161411094e3616---14004659444.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/v63lc2krjtnb6fr5k5io8rfht4/47503657332.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/1d1ce582ac398209c1a21bd597d8eec9/kanitomoxasogotabisiba.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/eb9e5b1c815cc1e0289003053ec0c496/23943943639.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/2340370869.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/bidazurerob.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/66742298770.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/90337348449.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/96830875532.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/41366922184.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_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 22524 bytes
SHA-256: 65f3cd9faf0e3fbb8a098aa33e94b236409c1e3d5044f9b989c954033119a9f4
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 10256 bytes
SHA-256: 49f985e82216964b10a2d2ba63b51df1307d630e0e75b6864e028fd2f380d1d0
font_02_sfnt_off00011e67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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