Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfdab3e5b04bf33…

MALICIOUS

PDF

85.8 KB Created: 2021-08-05 05:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3432ad113f2cba825f798c7c3922a4f SHA-1: 704076841b01d24d530f267c0d491a0eed236540 SHA-256: 7cfdab3e5b04bf3381cb6a800a4baa849c9c2a8859ce12508d8d528d9202aad6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment 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, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to external, potentially malicious, websites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://emmanuelmissionarybaptist.com/clients/74938/File/37943972023.pdf In PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9754080a1---xofebijipuwigosot.pdfIn PDF document text
    • https://airbays.com/userfiles/file/muvobenevedoweridotokel.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/61209927588.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9a1e312c---vinakifodotevuwatari.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/zoborikemedogovogulepi.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/56653606762.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b22fc457c---19233914693.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f6a0ed19cd125822e822f534b3e280f6/66298261573.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/sasitotin.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1cfd09c36---5344758761.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6eb9a295b---mabususujuzowazexebixefu.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/72286565160.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/zinabaveputajefofuvi.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/vujuj.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/vopajamufejisarar.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/34154538168.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/22797465831.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c4a256327---susidek.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fe7a64dc6---64457168017.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9001a0d73e---18483395070.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=qu%C3%A9+es+el+sistema+tegumentario+y+cu%C3%A1l+es+su+funci%C3%B3nPDF 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_off0000e7db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFED 17520 bytes
SHA-256: 652b94864317e515cda446ca646828d79cc4f2a3fddeae7ad8a31b4540ee04ab
font_02_sfnt_off00012bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFF 11424 bytes
SHA-256: be15d5ef3cd79e093e6ac4515c100e90c6afed64e7c2c13780187cef2c1a4f16

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