Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c40155e3278f9d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-04 01:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d548669b3e36edeaa43f3a121de9977 SHA-1: ab8022999b006c38879fa5d77817f8f5f9805960 SHA-256: 66c40155e3278f9d2fe7f5c0839d84d71e147107d921507290a34ccb2a03ed5b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with attempts to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • 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
  • 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://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43736a593e---88386988784.pdf In PDF document text
    • https://mavachhaiphong.com/upload/files/jaxapoduzafus.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/83738421093.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/29254740902.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4241768968---21642934493.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc35eecf6a3e7d8cb1263fb367945bb9/gapoxemugu.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9c43e2456a---bamamowaros.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ifi8k2ce3kif35c5l53g3pg68l/fazudewexesemibajikisekaz.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/r622glkahanldll99grrgdaoe4/26321059515.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/55429557058.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/2d0c326a68fa5e8477812e9e4041d4bd/dasigodunutug.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16104eeb84c858---tupen.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082c79916b37---83837870255.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/rasetakojubifugi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609836a3b0fa2---sabuzuto.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/11025976783.pdfIn PDF document text
    • http://ubest.ru/images/file/17909300553.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/zerabebaf.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/86863221543.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/177bdcdc8323568b2a6b30bdcb0082df/kasenumiburuzexezedin.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3edb536d7---75732883628.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610d53e55cb2d---pegalonajopu.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/18735167496.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/6r13doepsakbe15ktaqpgk9m2d/68397232086.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/15420920151.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/74858155913.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=converter+de+pdf+a+word+smallPDF 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_off0000b9f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9F6 10748 bytes
SHA-256: 01a5635c6f27aeec547a5ff4d5b01dc4f78e1db61689577b6350c625b70cbaad
font_01_sfnt_off0000d2d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 15676 bytes
SHA-256: 32d45e3fb852468cc06051092ecb04cff3d57c750620887d07f9cc0abd9705ff

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