Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5ff5e06710c366…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 22:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 59295651fe901d19186b4aaa41aac2f7 SHA-1: 0853b453e1b39faf25ce04fa30ea154193894093 SHA-256: fa5ff5e06710c366426c19b4b69c7fa3274fe8b0cb056323f1372014c4980249
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file functions as a link farm, containing numerous external URLs that likely lead to phishing sites or further malware downloads. The presence of compromised CMS upload links suggests a tactic to host malicious content on seemingly legitimate but compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://medvor.ru/uplcv?utm_term=sonic+before+remake PDF link annotation
    • http://onishi-kyosendo.jp/archive/18193860220.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/32288330296.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/6t3ak7231kgi8g107m1kmk7sg2/27779086775.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45cf7b654c---39153895057.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1305e7bf5---19746873236.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/6ace572863bf886725681b2c3834fd15/98662964295.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/sjs85c7k3m53n7r1m9pnrsr6nv/15730824981.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/gelubuzidabobuda.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/34204885547.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/mokoboduruk.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621313851.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a8391189fb2---finazozav.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/kunufizofaxizivanoruzez.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d860dbd9b2---wadafuwemegazorotuwir.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1ba5a2a0d---55198646162.pdfIn PDF document text
    • http://www.sealjet.mn/pictures/files/ragifalovup.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/kmnhnpes1l9s0dcuq48me4og82/5888531852.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f24982d12b---22249235819.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/f039e6d8c0d1483c54a9e535769bdc38/bokevixiwojepidaj.pdfIn PDF document text
    • http://metapolar.hu/tmp/lekopalatilosega.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609acdb94cae6---zazosopubofobu.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_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 10492 bytes
SHA-256: 95738c6c9578100217a572ddfc1b6a562894361404584d6520efe02d3dc3e592
font_01_sfnt_off00010350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 17672 bytes
SHA-256: 082b89d877537460e4536f638168dee47514939387ae877f4cff53c505a04b19
font_02_sfnt_off000131bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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