Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a786de7a239c99c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-15 12:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3f4e4ae70646b9ffa23e894f94d1dcac SHA-1: 50fef87488baed025dd325aacf3dba1b024215d3 SHA-256: 0a786de7a239c99c8e32be65c02e39c6de4eb633738b2bc1ed1c88f42e0911d1
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be redirecting users, potentially to phishing sites or for SEO manipulation, rather than executing a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://gberwanda.com/gbe/useruploads/blogs/files/zawesugugoviwumonevadi.pdf In PDF document text
    • http://sintjorisparochie.nl/userfiles/file/juwijajizevimi.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/bipuzabulesid.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/92852023386.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/91250337664.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/45312019141.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/bb6bffa4d45c7f0488b2c50d405fc125/dopegokewupogiriduju.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/nimegaxiboxe.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/rovazipalerorifugisojeja.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/34669592055.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6e2b84d7---18551661356.pdfIn PDF document text
    • https://mmszke.hu/files/file/nofupilum.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/xukipewo.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161403c4e85119---ratanilogalikad.pdfIn PDF document text
    • https://olterus.net/contents/files/xudiw.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f27b22e---99470034249.pdfIn PDF document text
    • http://scro.ru/pic/file/gisugukigujuxavutob.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/kinetezetikawodaju.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/59960831575.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/28920526936.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/slracsc9c2vngkpvmnrfnvfgdc/26919991695.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/f70i5indb975foq0fec7a995ng/gabanatoperezezemadukijo.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/80417437266.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/lugugifuzipudawosezetig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=delicious+world+romantic+cooking+game+mod+apkPDF link annotation
    • 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_off0000b232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB232 11136 bytes
SHA-256: 041c231599d517ea90a5de95f3fe023faff311ad58810de218ba6992554a6331
font_01_sfnt_off0000cc12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE424 16792 bytes
SHA-256: aebf7cfcd6fb329378f099a873fda370f0ba22884d26d9a451f1da5be0d59aca

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