Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b8ad9a5c8f6088…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 02:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7065a5e1a87496036932119d57792d1b SHA-1: ae2e190d72a44e1066c7b13cd823691f2f6d9075 SHA-256: c7b8ad9a5c8f60887f56448cb6f9769fdf73b816e7e9f0188c7ee9bf3ecbc8b8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://humanlitech.com/files/files/vasonu.pdf In PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/33967920954.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/nisumunutidibuwojo.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/ninesuzixolataloxib.pdfIn PDF document text
    • http://vibrobeton.by/pics/files/vabijukapefijojarasumu.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b37aa97d9---kewifozob.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b37f14299e---vowelevoxo.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/13727587417.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/6742306773.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372c4f13746---42498259865.pdfIn PDF document text
    • http://zkpower.net/upload/files/duvamesakebeg.pdfIn PDF document text
    • http://africareview.in/userfiles/file/89972849333.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/remixujowozifadojufan.pdfIn PDF document text
    • http://ohana1bbq.com/uploads/files/98848010502.pdfIn PDF document text
    • https://henseltech.cz/userfiles/file/zizeduvugipamoruwefuk.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/86315828402.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/29851755389.pdfIn PDF document text
    • http://svenskafik.se/uploads/fckeditor/file/sulabubiza.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/gaxokubiligomomeponez.pdfIn PDF document text
    • http://bsinteriordesigner.com/userfiles/files/kowanovugob.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/vadunikejina.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/nukurulexezejefovatu.pdfIn PDF document text
    • https://redac.ch/upload/17546716724.pdfIn PDF document text
    • http://etnorom.hu/pictures/39890982003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=talibon+bohol+zip+codePDF 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_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 10408 bytes
SHA-256: 5786be8f13a841663e3e4917ea22e644fc6c43b37a600a8ce039c9ed61f24374
font_01_sfnt_off0000f54b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54B 17728 bytes
SHA-256: 9a1267539b93ea686a10491563caba3e086e7c148cbb75f8ee511afab4cb4992
font_02_sfnt_off0001238a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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