Malicious PDF — malware analysis report

Static analysis result for SHA-256 943c937af7c2f9be…

MALICIOUS

PDF

84.0 KB Created: 2021-07-21 00:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7844ea0b9ad442508709f3b5403a62ac SHA-1: 69e6564f80f870566a77e6be7c87260b97407d36 SHA-256: 943c937af7c2f9be450f87f06e48ef388e7563d712a467aa397187fcb9cdf216
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories on various domains. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/0f0938c66262e2917996a267ae4078fb/6961319887.pdf In PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/eda24e2ecc605c05a6754dd676281d66/87869847027.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/821950601.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/46085186820.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082200c8c50e---gelonurejalevejaxur.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/novikezi.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb131187b1---25512227382.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/536bba828f4f4fc93d7a64c62d9d244f/34822391146.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b39e920d1fa---wizatarevosip.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/7d67e839a582b03f865f529f18d15c79/98229135417.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/oiddqv7nj88bg55og2umvmbr95/badukibejaganusuv.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/nasaturavoj.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fd43a8d8f---64465566427.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/2c72qa4k988bbu5j4fkr8hj8eg/17835316930.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/82861364851.pdfIn PDF document text
    • http://royalgroup.at/tmp/28112651142.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/sevatoxefupomosixodabu.pdfIn PDF document text
    • http://short-story.ru/upload/file/ziwifegimojad.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1bbc47d4f5---jidiratulanefitofomu.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16201959287483.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/sobovixafagutumugogupoki.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160927b79407dd---soguxupoliwakunuvafobasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=helicobacter+pylori+is+the+cause+ofPDF 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_off0000e715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE715 16412 bytes
SHA-256: b49b919ecf3d85e38755900fb26acd31f655d1a6ba7e0afa935dab800469aa6c
font_01_sfnt_off000111a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A9 10820 bytes
SHA-256: 9e7e6722535b5f3cdf75a667d4484e6ef183aab6c57d4212d633cbdb755a1847
font_02_sfnt_off00012a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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