Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fbc8c2e4f818b35…

MALICIOUS

PDF

98.8 KB Created: 2021-09-06 16:25:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7947316aa2b005a99cafe681b334f98d SHA-1: 3c99ba64d8830a593f6415f397363da1ac9de41b SHA-256: 8fbc8c2e4f818b35d093fa790f4a1431307345697dff1130e558f40789443fe0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d63db3e697---75271196713.pdf In PDF document text
    • https://solturism.ro/images/file/98541403860.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/bunabojitagijowoj.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/pb6bhohl6t0elutjfl346gql0i/jojoni.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/maverokupodofeso.pdfIn PDF document text
    • http://cfacgroup.com/uploads/FCK_files/file/vepitesexafakosexedel.pdfIn PDF document text
    • https://cahayaapi1.com/contents//files/98665008836.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/wewofaribot.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f7d7066dc72c35f9085aec41618f496/lujade.pdfIn PDF document text
    • http://mppscstudy.com/admin/usercontent/file/84218870184.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/706048304.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/zuzumabezefijiwane.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d70f455058---revajigakejeratupugun.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/96887030961.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/20122214200.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607467877a0f2---bexexaluzanotebuj.pdfIn PDF document text
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/ea7656b816997991c644608385150eca/48615009335.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fab1404702---vodola.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/wivegunadonim.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/47289858278.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/6b34d3dc606e754c076a1d0a6c7f02d6/84655453888.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/46677503003.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=formulaire+demande+apl+pdf+2018PDF 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_off000116c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C9 20336 bytes
SHA-256: 63369a5b6f4d304cadbbe27cd8808065f01eaad3a1077fb961ce9fcd49ca4d20
font_01_sfnt_off00014a1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1E 10972 bytes
SHA-256: f23440ed1ee10d34c2e821c90770883108e33c1423e12029a5af9269d51c4715
font_02_sfnt_off00016389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1