Malicious PDF — malware analysis report

Static analysis result for SHA-256 090c31dd05f59fea…

MALICIOUS

PDF

99.9 KB Created: 2021-06-26 22:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b8df7c32b5e8e7d778644b6d353daad4 SHA-1: 89a7f22675b0767810a714d14498842eab110451 SHA-256: 090c31dd05f59fea897ee4f24ba5e3cb7dbdbe8997172e6007740032f6dc4ca9
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure suggests it's designed to act as a link farm, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://haltia.mx/sii/ckfinder/userfiles/files/kuwov.pdf In PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608765e9507a9---nefalizulu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/7896977366e18ed3fbd0900467d811f1/84849138196.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a274015ab---23779399970.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/10137358bd5a4e5f17d39e9cd89bc99f/lubosasubuwinawomisuw.pdfIn PDF document text
    • https://icbacademy.com/upload/files/pupasiza.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/15151289177.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b1226a04e---54892860986.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930d7fb755c---7466216897.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/44cf14cea9d9a11ecca03b770eee0663/faser.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16086b2029bb6a---xazivadokito.pdfIn PDF document text
    • http://moreit.ch/productinfo/file/20475947324.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/ss7uh6k52bdvbaq1tvc8ngpl7f/sidusexibegavexamiwagug.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/np2bn7n5irk2vap4op4pskvkuc/80268832170.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/tsbn8ncurij73fjd0ho8hhepvs/54998368077.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/afae4280fa001ad14c93453e9298970d/gigizumewi.pdfIn PDF document text
    • http://laduses.nl/image/file/pimadewejusili.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e3ad3d12f---53661333066.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/0o8qls4f5i0hua0lp34iuun62q/waxejatuv.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/54b829265aa4529c281395dc5d96e735/63651137924.pdfIn PDF document text
    • http://kingcraftviet.com/uploads/ckfinder/files/vamojatin.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/68744647996.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/5719311354.pdfIn PDF document text
    • http://citra.cl/userfiles/file/71798717143.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=white+wire+haired+dogPDF 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_off00012765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12765 16880 bytes
SHA-256: af9cca94711e39f4368d03174cd146c8d6791d7223bc69de4b68698852692e28
font_01_sfnt_off00015318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B2F 10288 bytes
SHA-256: eff76a53a8afe1bd81045b428ae8c45440d8224f28d7e9c6efdeed4a749ba5f9

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