Malicious PDF — malware analysis report

Static analysis result for SHA-256 31058a80513c6999…

MALICIOUS

PDF

83.0 KB Created: 2021-08-15 05:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa307e2698b3d78ac0d163d6ad442802 SHA-1: ee50aa60ecbc1ab412103fd8536769e1b6a438ae SHA-256: 31058a80513c69998f8351e6c87395594538b268fbdb6a9b2aa556fd80a77f94
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the detection by security tools indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://landpas.pl/upload/file/36844874657.pdf In PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a21a9278c---67634783579.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723235e46e6---jeguliwewiweboson.pdfIn PDF document text
    • http://countryroadssiberianhuskies.com/clients/e/e1/e1b2222506e4b6fd6c510396e08362d3/File/giwepobomiv.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f478508f0---21384644176.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/b265e3cc3b5d484aa7ecff20e61f4e44/gatabuxike.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/526cd3400e33d7fe4c9c0f9c4ed161f4/71710079462.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097bcd4749bc---79601737682.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/letolemorudepovuburenev.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/20826566212.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/38543062464.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/51703276452.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/medijug.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160dfd0499899e---samawumikebep.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jazonixexozuwusopepunur.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/74103760204.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/murebuzimekowegumefu.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/29485904836.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b41c4329d---82766443110.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/37eb75633b9e20bab650319e4e395836/1536782180.pdfIn PDF document text
    • http://aliotoconsulting.com/clients/862286/File/tidozafawogorar.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/84455123641.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608928b5538cd---famaduritoromowonagumekur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=pearson+human+anatomy+and+physiology+2nd+editionPDF 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_off0000e3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE7 15624 bytes
SHA-256: 0d1a01c521e6e6802d8f747f49150b9e91534f4eccccb0fb810b4ba2dbdde3db
font_02_sfnt_off0001241d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1241D 11176 bytes
SHA-256: f8e96820b4be58ef9dc8f35789e6bde4710460f4e7b6bd1ff262ad10e7144d26

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