Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1127483fde09a5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-21 15:45:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6b6e9815f8a88704dd6631e8ac5e404a SHA-1: 71f57bb34f823e24a8f5c259509d6fd08e9f9611 SHA-256: ca1127483fde09a5702b1593380179aa9861cc04d74383faf42f2b72f1e7bbd6
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs and is identified as a link farm hosted on potentially compromised or disposable domains. The document's structure and URL patterns suggest an attempt to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://oniceh.ru/uplcv?utm_term=como+instalar+o+whatsapp+no+tablet+android PDF link annotation
    • http://cga82.com/admin/File/lajizuvelom.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/jovate.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361019c4f2c---mirib.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/16922599289.pdfIn PDF document text
    • http://vicc.huh.hu/UserFiles/File/5388056495.pdfIn PDF document text
    • http://leguido.net/files/xudugenawo.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460bbfdcf52---fukatepuwazizonodezofiriv.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161435915ae09c---65463276777.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/78897934967.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b5ec79e9f---74439868836.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1eec786f2---65330262798.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/gotejuwosuweruwosodolud.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/xanijokejuwogedanurij.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/tegunujediwegixivopefim.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da316ea453---8752678176.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/zunazixi.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/92114989627.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/161460baae1cb0---49459159223.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/82626226086.pdfIn PDF document text
    • https://tselectromechanical.com/uploads/CKfiles/files/pudunopatozimet.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/mitipelabamulud.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/xebodon.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/43126325411.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/xofax.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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 10916 bytes
SHA-256: d75e6981535de2e3567c9b9b242410c92952c67f75f0f5b2387f4166732be52e
font_02_sfnt_off000108c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C0 17824 bytes
SHA-256: 777ee4b6b83fa8a643b40b4f3f0209ffff12b0987082391e5d6ec82f6b1cf12a

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