Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce4951b5df03b9e…

MALICIOUS

PDF

68.6 KB Created: 2021-09-21 02:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 75335e368a45d21785355ea1765f2e99 SHA-1: a369cafc1255365ee4f4e1b9abfbe2a5a0f53b2d SHA-256: 9ce4951b5df03b9ef3ac56f3e29b5589aeb0960b99a081b5d477c27aaaafe704
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users via malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oroblupiscine.it/userfiles/files/42209738698.pdf In PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613d885a164d8---91002457051.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/mepip.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/28000273074.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe959e5ee6---36528441655.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/c8cece5e48bbedd472ad8492336a62f4/figerodi.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/vavalerobe.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/10340745756.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/71087672295.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/legexinalewepalodetibu.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe31bce97---dojilikejamu.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/risajeweletemit.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/wafikugagexekosaje.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/zotagikelenivijakesawove.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/62033086053.pdfIn PDF document text
    • https://mkart.it/uploads/file/tisukibesonutifepa.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/kimezutevulewabef.pdfIn PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/jejodobijarakojelobul.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/lijenanolederotogirilana.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/84574124026.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161410762ce57a---45653411382.pdfIn PDF document text
    • http://castel.lu/userfiles/files/fimemuxuga.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/lumesawunajov.pdfIn PDF document text
    • https://viceda.com/userfiles/file/wugafefoniruxugekewenabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=scary+bubble+wrapPDF 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_off0000b09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09D 15096 bytes
SHA-256: 195a48683df352f7d20b083c02e78c515680b70a4e2c2c1064bd7f0410b800a8
font_01_sfnt_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 10300 bytes
SHA-256: 383594f6188cf68d3698eef2eea4e1f128d39aee5b19353cda39e0475ac8db03
font_02_sfnt_off0000ed39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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