Malicious PDF — malware analysis report

Static analysis result for SHA-256 7551d985b3b5be59…

MALICIOUS

PDF

86.3 KB Created: 2021-09-03 04:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f02b8f55d1848993b0c6791249c6e70 SHA-1: 057d2d098a1799286b8b0aaaceaa9aabec71c960 SHA-256: 7551d985b3b5be595f78bffaef179a1fce50075ca167ad0e0978474445960139
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to host or redirect to malicious content. The presence of a 'download button' heuristic further supports the attack pattern of luring users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

Heuristics 7

  • 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.
  • 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://medizator.ru/ckfinder/userfiles/files/vodum.pdf In PDF document text
    • http://tpdw.pl/userfiles/file/44293462279.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/f7bccfb46e93ea8bd5da7227247731c2/28731434135.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bbf5e5cf9---kozaratarewawizomofagaru.pdfIn PDF document text
    • https://egyseg.eu/ckfinder/userfiles/files/lisari.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/4112860756.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/aec26pt4t541gqa90p1emnp9h2/litozewiwakefimuno.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/31082013484.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/15082131305.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111e9dd467ef---pizasagef.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/67810627107.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/demuninorevakaba.pdfIn PDF document text
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/fovunojaratamupebanenof.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770addb6d27---48880484371.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/pijakanone.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071eefe6f6b5---31902795825.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/210747202.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7b3ad7a5c---57654835979.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f56e5cd758---63071045230.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/71104817505.pdfIn PDF document text
    • http://holycrossyouthministryasp.org/clients/f/fa/fa15eac34f6f8ef5a8ada011ffef1578/File/49273441512.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/xedarafojupad.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/pagasisimudutas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=present+continuous+elementary+test+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000ff32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFF32 18540 bytes
SHA-256: fb9563fb4b59394bdef87a5ca8e129122e84222ea21519891ce543a434504ce8
font_00_sfnt_off0000cd89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD89 10996 bytes
SHA-256: fcb198834143ae1b6ea669abd19fc87f19aaad2b6cccc99c2a1efb9d2268fe1d
font_01_sfnt_off0000e721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011cb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB8 18008 bytes
SHA-256: 3b030767c6b09755d526d19c246c69d89d5b97dfea17c577f14d30dee2186809

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