Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3271afbc1403743…

MALICIOUS

PDF

83.8 KB Created: 2021-06-30 00:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8a5d982fb5c6f2c46374ee5d5229fb5a SHA-1: fecc3ba519c330aea6d7cbe840b733f0b7cc5fc6 SHA-256: b3271afbc14037435efae35364d8505c7d4d32d40ff1f83eeaa781ecbcefeed3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://sanipacific.com/attachment/file/3077290809.pdf In PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6d343ad463c45d028e02581a971a1f62/15877619053.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/87505410995.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608099938e5e0---kabosapigojulo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/c15f63a626327fadc3c66288886f0a11/89823536985.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ab23259e1---lapobokinevi.pdfIn PDF document text
    • http://beergolfers.com./blog/images/file/51997725505.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/fejapewodenikowinizutum.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/ce28c0b92054198cf27d3475411d1be1/86361104209.pdfIn PDF document text
    • https://mimpishio2.net/contents//files/jutusowesipizutuvogat.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/topeduxazu.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/pafemabumaxut.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607987848a6f8---66062371738.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/8d0343dcfcddd986778ac62602a085c9/zirumejanopalenegidob.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/70399180101.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a999567fd85---24005297025.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/e77ff8df896a6db287cbadcb0a6052b6/resezibotaneledesarof.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a66f5c5aa2---pulidilitadaxeduk.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/vuvefuwakub.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/zolukigeko.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/uk08v17t0pv223g56n8urct7ll/wisefaxup.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/49a1165971698c09dfa906292b5aed41/99374213516.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160a31bde2c3ea---76898549103.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/c968e20e001b30740aa6bc85a3bc6cec/filizezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=spider+card+game+rulesPDF 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_off0000e6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 10708 bytes
SHA-256: 456619493a1c783a51b449c07596fc7a9fbaf68f4d97cab76731bfeddeeb10be
font_01_sfnt_off0000ff21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 16520 bytes
SHA-256: ba4646edfa3f876469e80073a636c9b2aad8fe08262b1f9e3c6a4d8ca38e76bf

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