Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9347c49c51af761…

MALICIOUS

PDF

96.2 KB Created: 2021-09-08 03:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f74bb4944a0c252b6044afb696291e82 SHA-1: 42f7e4a99b567a8ae9a2c96ce64d987d2a2bfe82 SHA-256: c9347c49c51af7614e96a67c3b3b3cc5bf0e32c56050efea0806798647b74e3a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious content or download further payloads. The presence of a link farm on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/iam6lfio19kifos2oekre2e554/gadekuta.pdf In PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093d209b9917---pozugavupot.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/gilekegazu.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/kafaxoga.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/ridiz.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e8eca73617eb1fe8ca893c2435678dd/90935106055.pdfIn PDF document text
    • http://ylplj.com/ckfinder/userfiles/files/rititipuvupofoseziw.pdfIn PDF document text
    • http://1960ihs.com/clients/e/e0/e0b58928a48036c9af8d6cfc9cffdd99/File/givebax.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7bcda46f1---16458497139.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/a2nujjgqf2semq2keu1u8893d4/ruwifugip.pdfIn PDF document text
    • http://americanewbie.com/userfiles/file/71535463787.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4529bc7046b9348082defe4481e4bd0/66370734170.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/81094415888.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/sofavugirobanijo.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/15168870316.pdfIn PDF document text
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ccd3663cf86a4fb6c32cb662def6383/68573998317.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210902214459743532.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/34307904296.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160928a2c28c17---66186612335.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202108131901551903.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/941a3d7dd87454fa520808ee825ca203/48834448879.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/16715693532.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/d586bj6p6h70ncccqgua0lkb85/buxejenonakojeginajuruko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=toeic+speaking+exam+pdfPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39B 25872 bytes
SHA-256: 3d6aaa9ce4235876969ff0f2e2b7bef9b48c539eff8d37ec8d896be634b55804
font_01_sfnt_off00012389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B96 1712 bytes
SHA-256: 38e41d0d157d824f161e356751febe93d763e55152a5965c7dd7c0eff98a1317
font_03_sfnt_off000143bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BC 16128 bytes
SHA-256: e086d997b6ee3c3fe48f8fdf49e8854b9e9bef9c53b5c2c5f26bba4f2b277426
font_04_sfnt_off0001591b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1591B 10876 bytes
SHA-256: f621b56540f3ce84b6aa2f9e12635dc7b12f0a98b0982c37f93ca3c40d55847e

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