Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a8a26d747b0b68d…

MALICIOUS

PDF

74.8 KB Created: 2021-09-06 07:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d1529751a4e8fea5593664254237736 SHA-1: c0623381219881fdec8cfade8162184c58d76d1c SHA-256: 8a8a26d747b0b68d595b5459921af2e6fb624c6d705160465e23df14dd96bf77
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV, indicating it's designed to exploit PDF vulnerabilities or deliver malicious content. Heuristics reveal it functions as a link farm, directing users to numerous external URLs hosted on potentially compromised or disposable domains. These URLs are likely intended to host phishing pages or further malware payloads, aligning with a common phishing or malware distribution tactic.

Machine Learning

  • Nyx PDF Classifier clean score 0.2303

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=all+mathematics+formula+of+class+10+pdf PDF link annotation
    • http://digemnd.com/UserFiles/file/kawudazedituwiwusep.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/8nb3tcu9put8s0dh3ea05pksmu/ruwozekotegazutunamu.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/kuxunirigizoralomepa.pdfIn PDF document text
    • http://mecaniquekd.ca/upload/file/4587555379.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/45644232021.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/xolewolebuxude.pdfIn PDF document text
    • http://zonweringbelgie.nl/ckfinder/userfiles/files/kavusekozefujafudokil.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613265f734ddd---wubugaxuxopujodigobuf.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec504b46bb2---47679547618.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/79017948704.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/lbf2nhdu5460kf83jr9otfsevd/46827140579.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/29720612669.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60edf84684---16190187264.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ff6fad0544fefc96469af917f2a9669a/76449354724.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/nodowatopufasudiki.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/29063206999.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/wawupovewigokibulowefi.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/a1889f1654bef76e578ad0ec65ddad6e/jajesexos.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/sugagologipajewewiroruk.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/89965267504.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/52824155927.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202181133345814.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160728b72430fe---xekekivo.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4029d3972c8c775cf52d25e4ec03d3d1/38152860395.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/kebud.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/175452329460ed01b7d8381.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_off0000de00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 11036 bytes
SHA-256: 369a955d1b63d60709354f12f9962700341e5668074ea02f8c26a4f0a82fe277