Malicious PDF — malware analysis report

Static analysis result for SHA-256 754f5f1e58fd9dd0…

MALICIOUS

PDF

86.6 KB Created: 2021-10-12 06:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 91bb0565a21fc1c3e8800f3581f68cd2 SHA-1: c7092f2a0480ed52a2318917e86ddddf52845ab3 SHA-256: 754f5f1e58fd9dd0cd4e036adf460b0774f9f935292726d7da8b9c1e6b4b0e64
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=first+day+of+second+semester PDF link annotation
    • http://nwatchonline.net/userfiles/file/67556534762.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/robukukugaxojametesomif.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/77480446279.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/54100932796.pdfIn PDF document text
    • http://gojjang.com/uploads/files/38413890118.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/13284092669.pdfIn PDF document text
    • https://vgcanada.com/userfiles/file/vijaxisebijojamofikokefuf.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/16162634885777---witigodaxufoludoram.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/76218425049.pdfIn PDF document text
    • http://proficlim.ru/public/userfiles/file/wafapajavizurulojinam.pdfIn PDF document text
    • https://snowcat.pl/admin/ckfinder/userfiles/files/limegiderunozetutixog.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/73021985279.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/3of3d7hcb5889i6be1bqla43a5/68050662700.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/voduzedobojaxanemodog.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/9733037229.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/dokunijesalevubem.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161568a16c34f8---jawugivikesaditasanud.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/sugikojajafujodejag.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/fs8t63m8t16gdbjb8c1jp8dla7/rejowudosuguwawarires.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/xidik.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1616175516831f---nisugusasexu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1614d871976805---1355396234.pdfIn PDF document text
    • http://mebco.ru/images/file/vofexemivaloxunupoger.pdfIn PDF document text
    • https://zzhqhi.com/d/files/jekezuwofod.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_off0000e994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE994 19456 bytes
SHA-256: d075b2767979df841e0cc92a0a236555d1736f38bb09196db8b2090e26903299
font_01_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 10684 bytes
SHA-256: 6fd09279466a2b8cfc93b6c82dba3bd6c34c6ae8e96a2fc3360b5a8e0c88608c
font_02_sfnt_off00013486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13486 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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