Malicious PDF — malware analysis report

Static analysis result for SHA-256 52b8732e95ca8807…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 02:45:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7034d11d90f0254dd1ccfdedd334f889 SHA-1: 14d04055fb5f53c04b7af8455092d433d1f0b1c8 SHA-256: 52b8732e95ca8807651ff98eebd62ef0abea57766edff40244d1a7e04f4160a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to create a link farm for SEO poisoning or to host malicious files. While no scripts were explicitly extracted, the nature of the links and the ClamAV detection as Pdf.Phishing.Trojan strongly suggest malicious intent.

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=pneumonia+adquirida+na+comunidade+pdf+2018 PDF link annotation
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f113ac2269---56438733611.pdfIn PDF document text
    • http://xn--299akc5b432k2sev7g.com/FileData/ckfinder/files/20210708_14E02803AB91594B.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/28267209759.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b64164633---tewigoxabejuzix.pdfIn PDF document text
    • http://tiwtactic.com/userfiles/files/17431219392.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaa664441---8674863005.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/debozigirir.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/fewanagefudu.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/nulavokinasogel.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a56bb42566---bugamorup.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/43641168091.pdfIn PDF document text
    • http://decaldankinh.net/upload/files/70957591115.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/39747371318.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0440117cd0807640e72c113a80456dc6/mibusejejapilura.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/furanakevovumeraxemix.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ab1de44bf---95802669097.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/20828035181.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/86254112792.pdfIn PDF document text
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/vitokebexetivabov.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/451427713.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/salataximofafitud.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160abba0bcff3a---majegizuladexiwifov.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/99130225778.pdfIn PDF document text
    • http://keigan-productions.com/clients/863431/File/41489385287.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_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 11220 bytes
SHA-256: 74f4ca1a28928f139151c4d23aa82634aea8ef2b48a9c4d6d8bc31bdb66e2054
font_01_sfnt_off0000f197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF197 18456 bytes
SHA-256: 8863229b8424afef9ae452f1441750fba3e1798729806857490440f61fbcaa31
font_02_sfnt_off0001222c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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