Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbde33a9032a8c84…

MALICIOUS

PDF

72.0 KB Created: 2021-09-28 16:37:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d8f83e8e976d4bdcb09d0b977e1add2a SHA-1: eceda295bf872953192feaecd45ce10518b765c9 SHA-256: fbde33a9032a8c84e2463ea757f8fee8370faf2e0afd5dc4a1fb392a213e8953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/91011067014.pdf In PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/671g138ah9vpphvljm01th8dnh/96241918552.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/26151479902.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/gorexuvedigukutapawavi.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/52896383822.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f0af40a2b---mefofowakigulepurab.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/45158597488.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/zeresolilo.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/9211117760.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210918072931.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16143da3077e55---mugekexuzaki.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/80996868405.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/kudesovugowogabe.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210925_6D63DF04C2BA719B.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/q35v7c5u9sgg0aj8p3dk9a6vkb/mumimid.pdfIn PDF document text
    • http://www.optimizecost.com/admin/ficheros_fckedit_subidos/lusuporekumu.pdfIn PDF document text
    • https://t2sc.me/userfiles/mefegakukozesum.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/burubiwidunufusija.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/mujobojopagidani.pdfIn PDF document text
    • http://vers-ma.de/userfiles/file/67116961613.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/90135076564.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/30259988390.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b819d73745---natasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+remove+history+from+play+storePDF 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_off0000b67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67C 16708 bytes
SHA-256: f5c54cdeca414d7ed8d4d231cc90c31afb63e495e5b1374884cd18cd4687f40e
font_01_sfnt_off0000e118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE118 10776 bytes
SHA-256: 661b3a7dc9c9f4d39e61de79b825c4105b376a5e93d1fa2fe7f2194536ab359b
font_02_sfnt_off0000f9fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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