Malicious PDF — malware analysis report

Static analysis result for SHA-256 042a7ac6d815771a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 02:14:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66ba7b711c1247a24051d7431e4e3b63 SHA-1: b68a8993fbdded53d0ad567dea4cafd1937c1d16 SHA-256: 042a7ac6d815771ac0b922581380ffd1cc1fcdf08dcc9bc5b851dcc99c8e468d
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. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve as redirects to phishing or malware distribution sites, a common tactic for initial compromise via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/c7be60a44f5c471b65927136c8e1b8c6/20620622385.pdf In PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16078dfaa14c83---dalidanopedekorovasa.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868023420c8---51483931656.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/91661571118.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/46526833534.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/futawivatitiwuwepi.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/xavirakakur.pdfIn PDF document text
    • https://etimes.mn/uploads/files/66706118377.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072758b25fd3---xuvepujej.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e1b605e988b---jujoguxeriw.pdfIn PDF document text
    • http://www.moyekolodin.com/files/41117412806.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/7015c4cf6419ffe4e65faf17f7582af8/70019668006.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/gudurumazodateka.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160becfa6654db---18595253641.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/1e5066208038a64fdca6ada9799bb5b6/12398270709.pdfIn PDF document text
    • http://msamerica.net/clients/873634/File/85201360732.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a16afc63701---relejadegidifufararazil.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610ed9660551e---dased.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/33c83c248bb36652c329faed9265f22f/fekob.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3d51d111982bf76f06938a5a90371661/53345438931.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/2260ddbb2667807606142b9bdc350cae/89165679399.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e02886e653---98722392950.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/37122595807.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/r65827d0eqs1idtbrsp6v816ue/dafomosirigezetinexi.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/43059246073.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/63454360178.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pedal+power+4x4+manualPDF 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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 10564 bytes
SHA-256: 60ec6d6e636e5bf6f7931226a39f1573974d659b1d7e5ad21b80a119890c01d9
font_02_sfnt_off00011901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11901 17360 bytes
SHA-256: 2cce988e6d5c6fb69d148ce0d1a2df15dd5b5b0553488a051ce400bad7e29abd

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