Malicious PDF — malware analysis report

Static analysis result for SHA-256 10db2eb6627b3ab9…

MALICIOUS

PDF

90.6 KB Created: 2021-10-06 19:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c4d86a7f8373fa54c3c2148716010192 SHA-1: 7b6e98ac741b19bc7fa78528fdb2c6ff94ebbf58 SHA-256: 10db2eb6627b3ab90ad1442205bc2f1548ddedc1dfa87be91ef3fd88595f8616
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised CMS uploads and disposable domains. These links likely serve as a distribution mechanism for further malicious payloads, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://gamecoast.by/uploads/files/38441546409.pdf In PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16139c97548f2a---69397422271.pdfIn PDF document text
    • http://orlickachata.cz/files/files/49722058988.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161479c00d1851---wofaxiwujekimevam.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16151821a43039---16319139199.pdfIn PDF document text
    • http://pioneerbuzz.net/userimages/80478944607.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/87090986482.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc506581ec---26998028484.pdfIn PDF document text
    • https://haidangpc.com/contents/files/36948954417.pdfIn PDF document text
    • https://duel.pl/userfiles/file/mafidil.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/37349775494.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/11473514808.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/95929132681.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/pumidozufotapabana.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16138c2fdeddb2---51099944962.pdfIn PDF document text
    • http://ombelicodelmondo.it/themes/userfiles/files/buzilisezov.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16143aa717e3fe---nunabi.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/22568380607.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/8k0933edarjoemc8jgcdksd51u/wafimuvofevukesiwadux.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/41913856937.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/vukewetozupuren.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/ratitutazagufetetasu.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/65194224316.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cbse+class+8+social+science+questions+and+answers+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_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 17976 bytes
SHA-256: c90e5409df09037341efa5ffb499c1fdf909ab86ee7cf5ba317f61647036d2bb
font_01_sfnt_off000129bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BC 11324 bytes
SHA-256: d478f5298ca68487353fc53e8a0b6d739273ab23dab78f0c0dd048c9925d1245
font_02_sfnt_off0001442b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1442B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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