Malicious PDF — malware analysis report

Static analysis result for SHA-256 4752847b40c7e32f…

MALICIOUS

PDF

78.9 KB Created: 2021-09-15 23:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a336f3562f0548dec4a68f12882805d6 SHA-1: 60664b27bc434ac10cb7f6d407762cf6d21af1f7 SHA-256: 4752847b40c7e32fe8caf37a9d5209fe3435e630f272dea9fdf85e67fe20ac64
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 various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The heuristic firings confirm the presence of a link farm and external URI usage.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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=mother+load+adult+game PDF link annotation
    • http://arnoldbolingbroke.com/ckfinder/userfiles/files/wasugewuwopaxe.pdfIn PDF document text
    • https://bodykneadstherapy.com.au/ckfinder/userfiles/files/27220093894.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/kidoleworurowuxutilufubul.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/18625422084.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/mulamanubuv.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/18959172208.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/62544584847.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/93765781527.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/f626d5bf59ce861e4ee202280a334fe7/tuwiregiwoj.pdfIn PDF document text
    • https://orrizon.ru/images/file/64517393450.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/jawaruguzime.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/59435981484.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/83858230418.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161325475b1f8e---gewuverakevetinuk.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/fuxekexudufefuxevuripuwak.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/kafugebavezofifi.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/53361715361.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/99108536387.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ilrr13jbcia0rnebuh87kqfnc5/gokunurum.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/3075402289.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/16832720472.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/16714650706.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/83747944958.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_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 17084 bytes
SHA-256: a552f3f4d4f62f274f78954232feb34b730a2470a0cc2bf38ed46bc27f85692c
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10424 bytes
SHA-256: de851b5d274a16a152d75bd9fd00943e2e382d60bdffec2521d26e079cfb3a3a
font_02_sfnt_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1