Malicious PDF — malware analysis report

Static analysis result for SHA-256 f55c21489ef22e2d…

MALICIOUS

PDF

76.2 KB Created: 2021-08-31 10:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d87487ecfb3915d65623e0281bcd47cf SHA-1: d69cba61118ae96f906b1f5526be8fe4b13aa511 SHA-256: f55c21489ef22e2ded76f3c3afd704f4b1a0cc90b4e5e755f31d8101c13cc2c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate an attempt to direct users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://keletunderground.hu/images/uploaded_pics/file/49328411284.pdf In PDF document text
    • http://essentielles-theater.de/UserFiles/File/35996844926.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/rutogerolozivaki.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108140203072457.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/a824a692c146a36028604636398a3486/loxuwusokomuxel.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/64744349250.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/besefudafup.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2411cc5a951e00d94b15320798fe2d78/24811679608.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/navisugakegisakojugifo.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/22898437156.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/dugizofevop.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/02p2fd9jb3nnr4gpi6tstkd7jq/1630824123.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/16016487450.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca3fe8b052.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4q6o30tg1ujtlrlipi525ihisd/69209567005.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/33285287783.pdfIn PDF document text
    • http://tms-operation.com/upload/files/24254702980.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/suvoxifelavajiwef.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3m4h071rgkts32fshl9tj18od1/98817872726.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bc71d152c---34773427237.pdfIn PDF document text
    • http://hiroshima-teishaku.com/userfiles/file/11054594425.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=7th+grade+constitution+test+study+guide+pdfPDF 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_off0000c37b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB92 11020 bytes
SHA-256: c5d7d07aeabe0bba9ed0b6671778fd5125285c3a70bb0d29f59d758102c405ab
font_02_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 17820 bytes
SHA-256: 69492c268195bd05dc24933d77358898ae3e0f384f4d76547560f9c82eb42329

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