Malicious PDF — malware analysis report

Static analysis result for SHA-256 557d6bfd04776284…

MALICIOUS

PDF

71.7 KB Created: 2021-05-08 14:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 425677fc38a9330d8bd9a1856634df85 SHA-1: 1d8f4a85fea97c02cfd03a4a0f3889c9241171ee SHA-256: 557d6bfd04776284f52454009789c933c799bbd61dabc7123bc566ee0a1179e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS platforms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF creation and a lure related to 'restaurant brochure design free', which is likely a pretext to direct users to these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://archism.ru/uplcv?utm_term=restaurant+brochure+design+free
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/ce08dbf15b021ecabda0e97deb0d7d70/84986847139.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607980ed2b4c6---setijesowi.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/84782a45202d720a4b15b3d1cd045892/vutejiwumeb.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6af8474c9---11012670088.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/de68cbf25988ded7fa205623fa075455/belit.pdf
    • https://amrapalispot.com/userfiles/file/81797171984.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772de1a3b92---89005545897.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/0e5eb9dce87d07308824f6d38cca9c38/momipibafibesolowewunu.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714d967fffa---3636954158.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088648f49ba4---49770989353.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786298e5291---kipesopuxavetosilo.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d6e7e6359---76663130870.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845a3a214c3---fepap.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608762b35c768---29649979292.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/065b47bdbfbbbc1e43e2ff3f5794676a/kudiwifaju.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d5cf63b4fe---64828437745.pdf
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/a62a7ca3f2a923c70c6007d908bb414b/90859739397.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c8.bin
108b9f92acdbf5bdf96cb3207945609d2335cc62e95a8caeaaa62290151a8264		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 5396 bytes
font_01_sfnt_off0000f322.bin
c9d601102a2f6d949ed69b231c78df7d17f815f30aa62e9ab14b41dfade1f4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF322 10792 bytes

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