Malicious PDF — malware analysis report

Static analysis result for SHA-256 55693b36ef3d98a0…

MALICIOUS

PDF

76.6 KB Created: 2021-09-03 09:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f19462c6e8a0e4c7797fd17d3257db0d SHA-1: a27a474bc92e2c8aa1608b430f5f5ff3ab2e2aad SHA-256: 55693b36ef3d98a0f858440d00cbd43186c1f4a037c5bae76bceb80618c3efe4
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports the lure of downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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 https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/h05c249eeu7770ul2u2bf6ko70/bixezekodokune.pdf In PDF document text
    • http://membranekeyboard.pl/_data/file/kevofovivomovajile.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161175aed5f584---14465882511.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/rewezelogikabiravivijo.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf4c6725af---44484119344.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a8a63cbf8133e4d05b7ffb3e45b3be61/14506365726.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ebb4c2129b3c9a77f28a9a05e5634460/18106090606.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/23e6afe66db39a2863131f76c1495eec/74818382542.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b3f696c4b---78601912284.pdfIn PDF document text
    • http://fxmeat.com/upload/file/82a8a61768fdca3f6fe0fbe328f1d8ca.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/musokakonererutopej.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/85587867493.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf22f851771---8781343392.pdfIn PDF document text
    • http://demkapi.com/resimler/files/26003152827.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/zedolipirepuwebosasoke.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/9053685aadc410a81eb911da47817c34/31012774568.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d39a4311c6c---99742061895.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af61974176e---2247982971.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/tisutifepuxewopilosaregex.pdfIn PDF document text
    • https://x-software.cz/data/file/53092192715.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/99768521848.pdfIn PDF document text
    • https://machnik.net/ckfinder/userfiles/files/wifese.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/midojavobibusipasazetop.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/sekapezineje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=convert+pdf+with+arabic+content+to+excelPDF 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_off0000c52b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 10976 bytes
SHA-256: 7079c30bb4b0ab6651c299e7e15210686cc66a424ecf350d5c1d37ecbce2ee7a
font_02_sfnt_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 17604 bytes
SHA-256: c82c0c5cdabc57eb66325e1f8ae1c4eb8ffd1ea5025ccbc8bd803d0ac2f3bf2a