Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc03e4df6691bda4…

MALICIOUS

PDF

77.4 KB Created: 2021-09-05 22:28:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2baf7d3d653dda0e693eb59b7832b11 SHA-1: 1b6ce802cb8f069ac7bb434370542dcb22c48bba SHA-256: dc03e4df6691bda44be3f47129d85712443d2fdc12af62d685e332924bdf811a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a link farm pointing to numerous disposable domains and compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://dynamic1984.com/user_file/file/94381825081.pdf In PDF document text
    • http://fotokeramika.bg/userfiles/file/15447665999.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e99df1cc9---pijosa.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/kurodexuliv.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210815030728.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/tidilizowef.pdfIn PDF document text
    • http://gensugroup.com/upload/files/nudogubituvuvoxagikifebi.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/2558699693.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/qepd0bs9faq8ffn1u8n4cabe54/80937695367.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6e6f0932968bc01c91b611482704a449/bugug.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/krh5pcbnvffh8bfqdgha2tptb8/41256816431.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a2c5c9794194bf100977e8338b58b2fd/kupobiputalofaxufin.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf46a89fcc4---juzumufezuxonowam.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/11b2e58830d1b1cbddb5026374223467/35085770490.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/81422161661.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/20612144697.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cdb2068df---12331503549.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124c83014d49---poviwepizara.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/73512519696.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/pagul.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/77319704989.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/60537379733.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=supply+chain+analytics+nptel+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 10784 bytes
SHA-256: 68ada0d69447d7fb4a612a16fe6f57d75e1d8a0b8d9bb6ce5d31c137c8f3a649
font_01_sfnt_off0000e45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6E 17080 bytes
SHA-256: e691eb4afe55c685b3cc3bb4561cacce8d63427bcaaafd6dcdaddbf01ca32f80

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