Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02657d4a2c094f5…

MALICIOUS

PDF

99.3 KB Created: 2021-07-25 18:04:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a04c2611d233f8cdb0fc82d7fec2a9dc SHA-1: d10d8aa5fc899d523a2161bbcc2079fae019bb44 SHA-256: b02657d4a2c094f56d6148e81a1a1f3bf79f1dca5c3b21729303fd3986e03b2f
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 functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites, suggesting an attempt to lure users to malicious content. The presence of multiple links on disposable hosting and compromised CMS upload storage further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/6eb9ee6a43c92e746e97d6c7e5af459e/mupanawumifenokox.pdf In PDF document text
    • http://pcccphucvinh.com/upload/files/27185667105.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/85931167417.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/sixofisojonuxuladotela.pdfIn PDF document text
    • http://dzbnf.com/upload/file///47432779526.pdfIn PDF document text
    • https://baongochoa.com/upload/file/76583104077.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/luieit9bsqcenu55uls74a33jt/42703531849.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/63806071170.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/1ab37f41864c5223517a5d0dd6f2d793/9330360777.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/dilal.pdfIn PDF document text
    • http://kotolantopeni.cz/file/86297682231.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210528102036.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/35393578190.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/4447vk20i5qdi64lf6ugdeh5mj/14572226583.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb5c76e37a9---rudumigupatanexi.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a46f464499e---38117938646.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/51103301958.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/mubawijujosagifojesekabi.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/26170765483.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/965375b33b26372e13fead1b068cfd0e/46693959966.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/eea2a28e95cbab96d435f517920e7261/76325167886.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/072932c539aa5cb53c109c22466d77ce/ludefodifir.pdfIn PDF document text
    • https://airshow-bg.com/file/61724597497.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fdb181b4c---78318335195.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+heat+costco+spiral+sliced+hamPDF 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_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 10752 bytes
SHA-256: d0b30c85a0df310252e2cb7b18da9806dc44256514467a03669174c62744c330
font_01_sfnt_off0001333c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4E 18744 bytes
SHA-256: f9f74acd788ca18b6ff61271824d851feae6c79743201de96f89ee372a259393

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