Malicious PDF — malware analysis report

Static analysis result for SHA-256 472387626615e31d…

MALICIOUS

PDF

100.4 KB Created: 2021-07-31 02:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2ae00c330f12ae90f60ed0d15c7c3896 SHA-1: 88eb26da8858b577ce4f9bdfdeffda0e5d7a01fe SHA-256: 472387626615e31d2ceb19bf46c987d630810dee170807c2c9dd808ec58c8547
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and heuristics identified it as a link farm potentially used for SEO manipulation or distributing further malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9880

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=mishneh+torah+espa%C3%B1ol+pdf PDF link annotation
    • http://sk-uralstroy.ru/uploads/files/nusowomimozapasupegodimok.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/71744470495.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/wuwekizikalukozu.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/lunowokigaxodozotifes.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/80005111925.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f05643578---naratorunux.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cf01e5bc0---metufuxumavube.pdfIn PDF document text
    • http://www.asslar.de/downloads/38317470404.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782d47bdf82---77535179094.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/teriw.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/84ab0265ba08c730aeea808c4d62c8b6/xomezezuwagawunilekiv.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/bbd25f663c19ed8b646ceb5a095198b1/45494332704.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ec5818a72---nuxuxu.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/jawamanufu.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/95906742510.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/5471ab933d30d528f1d990971819cbe1/besukenirapuzikuf.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/2925cb7c7063398dcfd22097f5603264/39298658675.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/19335892039.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/51008981795.pdfIn PDF document text
    • https://dptech.vn/uploads/files/77754229420.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b864adc1354---13178946880.pdfIn PDF document text
    • https://binhvi.com/upload/files/tovazunuwodu.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/57668164642.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cc269331d8e---77581591368.pdfIn PDF document text
    • http://meadspool.com/clients/8/8e/8e46726fd42f39913d2349bbdb4e70c4/File/71071109930.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160d353771dc57---koduzesikegugodomivinude.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/d6fe80a82f6adb7f24cb31da9eec6236/90982577180.pdfIn PDF document text
    • 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_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 10792 bytes
SHA-256: 3dab678e831b175b686f619175ca256a0df9277cc88e7c91ed4be9e382471541
font_01_sfnt_off0001375e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1375E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F70 20432 bytes
SHA-256: 6edeb23e5efce573770bb8c58b48d295d1a7c5cbcddfcd2cc0a4672d3c6c7aa5

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