Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1fcb8edab12718…

MALICIOUS

PDF

78.2 KB Created: 2021-09-21 08:43:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9aff06e2b3a6d7660768c419698fe7ef SHA-1: 0c0558e22d9147733c86fb6b3fe3072639d100b1 SHA-256: dd1fcb8edab127187e3bd7e497774b3f056748c2cb92edea18ad4087dad8e27d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://laborke.ru/uplcv?utm_term=afsos+karoge+song+download+pagalworld+mp4 PDF link annotation
    • https://hoangphatdanang.com/uploads/image/files/32706625066.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/9757309540.pdfIn PDF document text
    • https://safewatersolutions.in/ckfinder/userfiles/files/68417529059.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c29e2d5e5---mefepidone.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/30504637004.pdfIn PDF document text
    • https://quimicasorocolor.com.ve/ckfinder/userfiles/files/86853117319.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/23587556741.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/puvoju.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/pagowov.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/buletelipufuzumagukeg.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/vukexum.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140e690810e9---89315653473.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/sawifat.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614076104ec5f---98852436838.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219131559196537.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/pugexetedusolodiwumu.pdfIn PDF document text
    • http://xn--h1aeekk.xn--p1ai/files/file/55593706303.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/35647929767.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e576690ea---83847970764.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/47249576090.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/roluvefojudov.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/20903517167.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/guduxoxoforik.pdfIn PDF document text
    • https://mobile-translator.eu/app/webroot/media/files/pinegof.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/68099644780.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/34969610187.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2b0330299---93508839960.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_off0000c58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 19568 bytes
SHA-256: afe952a9445ec61eca827fbe3c027fc1b52892a0e88b96f848663f71e7f6d70d
font_01_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 10888 bytes
SHA-256: ee4ccdef845269b8d7114e68af25c814c3222840a5577808879b0d7f81fc25c8
font_02_sfnt_off00011223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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