Malicious PDF — malware analysis report

Static analysis result for SHA-256 225841c6783c61d9…

MALICIOUS

PDF

85.3 KB Created: 2021-09-05 20:33:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ee6fe3aa1258583d8c5cf55c38b94d47 SHA-1: df57e784e12adad9d1b700846f7829df0bd5a899 SHA-256: 225841c6783c61d95c993c49ae760cca2283880e101be4259b682865e9fa99b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content or phishing sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

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://smidgel.ru/uplcv?utm_term=science+reviewer+for+grade+10+pdf PDF link annotation
    • http://karthikeyanjayaram.com/userfiles/file/gonobudu.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/pevezajibifimesur.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/jb75v8dq2cna321e7prh2qb7d8/16860129341.pdfIn PDF document text
    • https://agatanorek.com/files/file/55200823716.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/14825480991.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/76816681691.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078625e883ab---19731657736.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/xumadumagawezufixewokot.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/tajozutubekojevisati.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5059ed2fc---nafilasuwikanot.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c1edcbe79---pubuwiniwa.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210802220126.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddec45127---wepatebopog.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/14459855124.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/lalibikisudokiw.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/f976844de168b70f4ea135e371a56ebc/1862846516.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608621262ae6b---81012601429.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/irjljjgfpksq7vsvn82m1tekeq/41752123072.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/28492879712.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/37657695776.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/pogagi.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/98602412628.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/7788153044.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/tawesage.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_off0000e6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AC 10884 bytes
SHA-256: 885355e74d729c4f92107141290cd6c33798cf112f737083d7051cf33f142ec5
font_01_sfnt_off0000ffdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117ED 18220 bytes
SHA-256: 6851073c2735999300463814f63fa7cd6478d82f5c2a8d42e7d5e11c9dda7d52

Open this report in the interactive analyzer, or submit your own file for analysis.