Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbc10923d97bb0b…

MALICIOUS

PDF

72.6 KB Created: 2021-09-03 23:35:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 966c5fd8d511bf045429b307a36d2ae3 SHA-1: aceb3dd65f9dc05becf331f71257687aa3b2ff68 SHA-256: 0bbc10923d97bb0b5939084278d698302371fd5ccf60b72ed3faf6f83624457a
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 ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607000a501449---vegubufudiwopanetalolepul.pdf In PDF document text
    • https://noddy.nu/images/file/90479523755.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ce271a6bfa2---77254139885.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/8694999140.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/nulurememumigewinenolegu.pdfIn PDF document text
    • http://beiks.info/public/file/ridugirizufokifiri.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/doxixuwusosujigivunawi.pdfIn PDF document text
    • http://torgoborud.org/images/file/87707024581.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/87frm2r5v0onvqud7tui0hchj3/murunopuzogiminuribima.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/59901665873.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/fewexinosaxalefipazu.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/digunivejuxubotixovuxa.pdfIn PDF document text
    • http://simonide.org/userfiles/file/bokebeforugokija.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/5a1b574dcbe88e7498304fbf78b569d0/86155105022.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/dutinisirowigazek.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/bemuvakixubukupuguran.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b41c408f269---notagexubusexi.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/76163842939.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/7b5fdbe6825c127f03c1b44fe1c0ac6d/rewubab.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/womikifesumumaze.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/82712899031.pdfIn PDF document text
    • https://svetplus.com/userfiles/files/85251886959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=submitting+a+manual+tax+returnPDF 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_off0000bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC35 15812 bytes
SHA-256: e4cdca06867296c0187958961bbadd56393acb0b165656181a0277abeb44b6ca
font_01_sfnt_off0000e48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA6 10580 bytes
SHA-256: c521cf1cc2f4a4d9f85840cfbb9de85983b71cee74891565da5576e0a4aafcb5

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