Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc7f5ac955348df6…

MALICIOUS

PDF

69.4 KB Created: 2021-09-16 00:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5b8d502dab9f1d755d6321992a30eab7 SHA-1: c6f18a3717644de003e35ddc6404bf22141759fd SHA-256: fc7f5ac955348df6ac7b8f91857931fd929714b312c280d3b8c1bf93de7a6083
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The presence of numerous external URIs and the ML classification strongly suggest a malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=skate+2+apk PDF link annotation
    • http://newkontakt.ru/userfiles/images/file/vewojejaporogolemugesaneg.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/tefuji.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/wonovorameroxivafu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16137d8fbc01ee---jevavejonazujimukuz.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/42735611169.pdfIn PDF document text
    • http://arsvet.ru/img/upload/70176451160.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/dibekobisenusejazib.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/66532748927.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/lozojamupetuzijufekuto.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210912222830.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/042c7213105f25f773dbace8965451b2/lezoxakobiwinubipokoso.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/35135413249.pdfIn PDF document text
    • http://briztravel.com/upload/files/91114749460.pdfIn PDF document text
    • https://playindiano1.in/ckfinder/userfiles/files/34977005697.pdfIn PDF document text
    • http://mardeestilos.es/fotos/file/13917114041.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/dabupilero.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/juvudomasole.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/126f61b7e933389e8b522c63453885ae/49776982959.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/tadifelaful.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/63698499652.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/76118472026.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/sidof.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109100049573808.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e80e22ef5d---lilujebu.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_off0000b398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB398 9900 bytes
SHA-256: 087c47316f27adf96b863abcf534b4cfed397b321d6286451abe9d3030e907d6
font_01_sfnt_off0000c9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 15088 bytes
SHA-256: 968863be271ace5e301f9d4d8b4a6667c4bec6e46cbc9c37d269edd8040372e7
font_02_sfnt_off0000f018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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