Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5312e559865f58…

MALICIOUS

PDF

62.5 KB Created: 2021-09-21 23:22:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: adbcc253bf19fb74963f288cb89c18aa SHA-1: a5ac6cf48f1698d9720ee0cd83b1f01b29737d50 SHA-256: 5a5312e559865f58553d4b2aa0eadb6cceb590c1515f7ffe414fb98b0c68eb16
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised websites or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8601

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=csr2+money+glitch+2020 PDF link annotation
    • http://4998horo.gmmwireless.com/contents/files/12394944503.pdfIn PDF document text
    • https://4cmedica.com/ficheiros_upload/file/fuvakolujipuzobukativi.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3586c2b6cfa4c78e485eb6b88a9b51bd/zudalufefev.pdfIn PDF document text
    • http://marchmontnews.com/imgs/file/29054336055.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/vozokininegagezafefumuge.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/gulelaradajajonifoviko.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/90810411567.pdfIn PDF document text
    • http://sbairs.com/datas/files/56987198246.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/nulanigukeligevef.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/86802044227.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/36180840437.pdfIn PDF document text
    • https://cet.sk/res/file/detodisufizad.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/14852423331.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/107084f583c6ee2c06747c8ba6e91b21/faxesibu.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/buxuxegogevabamozerorixe.pdfIn PDF document text
    • http://biondiairsystem.it/userfiles/files/58789250991.pdfIn PDF document text
    • http://eko-uklid.com/files/file/5302966787.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/51829267232.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614a29db7f430---74571232832.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/topul.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43df0757d---75975755240.pdfIn PDF document text
    • http://strap.sk/uploads/files/wovisilizofujur.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/36898227564.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/45030425643.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD1 10904 bytes
SHA-256: c600d1566f15bee3ef5d25df9a4e1b339c44594fab5a1625eb2bb5f132e6aee0
font_01_sfnt_off0000d3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EE 17308 bytes
SHA-256: 3a605f6afd9c39ece2e69ec6be25f2c69377ad40ec6c4a272ebcf725b33be053

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