Malicious PDF — malware analysis report

Static analysis result for SHA-256 3da62c1e07fd2359…

MALICIOUS

PDF

81.9 KB Created: 2021-08-22 05:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 15a9598347ee4e64f9e528d2678ff96c SHA-1: 436b9e08685dbeda857080ebc1eedaaa046b3887 SHA-256: 3da62c1e07fd23597a71d3fa534ab0c037e43402249b9eec888052e39f752d01
104 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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://garglob.ru/uplcv?utm_term=assistir+filme+como+eu+era+antes+de+voc%C3%AA+dublado+online PDF link annotation
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109fa2309372---60580702373.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/6928599936.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/nalujitinuz.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/fbjricluhqkj1uf1ipn0cvqngu/dutiwiritipepebomonud.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/6171434067.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7b1027a8a---sifiritudetetiwuxutida.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/75066154178.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ec19a1bf7d9452c35a83a9a9a456f123/62072283060.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160921604a29ae---95500459162.pdfIn PDF document text
    • https://retta-bg.com/userfiles/dogorisivu.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dukewabidukar.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/vezexajoxam.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c673e27c49---43207555946.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/99042612904.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16070c39e0ea9b---wogenujigo.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/68824283829.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1678ae189---29582446673.pdfIn PDF document text
    • https://brod-plovdiv.com/images/zodawemekitud.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/d93cdf564537b61e36ea4404450fbb58/musaxivonusogoleg.pdfIn PDF document text
    • http://cezanart.com/userfiles/file/burije.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/589830621e2c65d5fac89af80a60995f/renomarovowudubizujewine.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c9f010e9d---1426587463.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/9562737841.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab459e2836c---71303538506.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/41c96efd5cca267fd2e209eeef446166/jifatelaxuz.pdfIn PDF document text
    • 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_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 11084 bytes
SHA-256: 05a34179c8c88892a75ade82fec6ac1a62f50b4ce4df670ba877c94df4c94c01
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001076b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1076B 18800 bytes
SHA-256: 54f9c3234dc2569bd16526395e8220c7864827ae0eaac0d53738785731f485c8