Malicious PDF — malware analysis report

Static analysis result for SHA-256 8013a83717c5b254…

MALICIOUS

PDF

80.7 KB Created: 2021-08-13 10:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6b449284fa7c4965414c67ac2d31629b SHA-1: bc8374a5bf01823f8cf8a701ce2b3f32c4f4e085 SHA-256: 8013a83717c5b25451678b861f796665b9d5bb0ebfc3a5b11b3c546da081a3f5
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis reveals it functions as a link farm, containing numerous embedded URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress installations or disposable domains, indicating a likely attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4740

Heuristics 5

  • 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
  • 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://chcial.ru/uplcv?utm_term=ejercicios+funciones+del+lenguaje+pdf+2+eso PDF link annotation
    • http://thunderstar.cn/userfiles/file/20210502205218405991310.pdfIn PDF document text
    • https://aashianarealty.com/file/41837255665.pdfIn PDF document text
    • http://agro-norwa.pl/userfiles/file/51889846684.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/wutijudafaga.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec66a8c145---poxejif.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5bcc05b890---63196171283.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a083fcbed7b---tebevibufifuzamebiveruk.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/diwulezesolagen.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/gogizulefizit.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/9880388244.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609def530228e---wolasemakomefefazigud.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/lapofuzabodutavo.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/sififulivufilabafo.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/riwopajizizije.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/prgm2db9rfj3c2um213sk0napr/40217445760.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/jakebok.pdfIn PDF document text
    • http://helpibr.org/clients/f/fe/feaff840d005acecac0f151e8679c8db/File/kaxemumozeniwim.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4666824b8d---mopojeletogulu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/c2f41901aafeb900af1fdb92abebaaa9/61252150824.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/sobepomidabix.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/8957636326.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/44822277373.pdfIn PDF document text
    • http://donghozibistore.com/luutru/files/vupusivej.pdfIn PDF document text
    • https://parc-hotel.info/file/86300928830.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/metojiguregaturovipave.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B3 18848 bytes
SHA-256: d27650cf6684ce665699898044d20c4b32687dfff418aab3d125a75376fce64f

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