Malicious PDF — malware analysis report

Static analysis result for SHA-256 f19621ebc5f5eb2e…

MALICIOUS

PDF

78.9 KB Created: 2021-07-10 02:33:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 0d9e5438a1d1a79b69124cda74fd4d15 SHA-1: 2740749cd65f3cd353ce11da6ad9ee8c6eae2154 SHA-256: f19621ebc5f5eb2ecdf3089b32ed10bf56dd6af4f1a9acba13f234c08a83cc4e
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. The document contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading further malicious content. While no scripts were directly extracted, the presence of external links and the nature of the heuristics suggest a phishing campaign designed to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 8

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://simonhoirup.dk/userfiles/file/73974902749.pdf In PDF document text
    • http://austria-ex.com/images/blog//file/vijidekiviwebifuporixu.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/40517951006.pdfIn PDF document text
    • http://owv-sad.de/userfiles/files/pakulirozubibizave.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/71fd5ca161626d3d272c7bae19c7e136/63103908215.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c94073a1331---fexesusedorobojul.pdfIn PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210616_B498FF261487FA05.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/9aa8b9ba550f1b9b1acac86c421a18c0/wirifax.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ed0d9a0d7---94924455560.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/5309614484.pdfIn PDF document text
    • http://cga82.com/admin/File/fatotimilofeganunura.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c314f5cf5e6---71271337276.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/70750893417.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/b06271e06067843dbb1214d7191d5c77/vovidolen.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfcb2a865c---22088869655.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a86d0058565---53717318535.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/bujowipixizurowised.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f114d80c---24758327498.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/io2np7qtthbfj6o76br0dj9bm5/bibamirufinipe.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607800a9a9c30---7581540579.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/75479985680.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/rinitusufoxirupuridi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=harry+potter+and+deathly+hallows+part+2+123moviesPDF 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_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 17720 bytes
SHA-256: e3e75f427e1bb007b5c277d6c318a9246d7830a0047887002dc5295a64518669
font_01_sfnt_off0000f9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 11260 bytes
SHA-256: e967eb817621f06f3c2a645f5235a76902b715296a789ee65054c3cab8a17816

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