Malicious PDF — malware analysis report

Static analysis result for SHA-256 993ffb0689e3790f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-05 22:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 16c36e156ad5fb8b8d6f52aea5d11159 SHA-1: b202f25e9b9552cb1dccaad0a452e98a7cdbf94f SHA-256: 993ffb0689e3790fdd84895cde63039aa606a11715a74a2defa05c0e05c78613
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the ultimate destination. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this is a phishing or malware distribution lure. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=internet+industriel+des+objets+pdf PDF link annotation
    • https://bursakaynak.com/userfiles/file/30747243876.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780d2e7afbf---zowejinexozabubunovawu.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a25fd0377f9---92186908261.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612d4c49f3cbe---56880764170.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/fawugi.pdfIn PDF document text
    • http://land89.com/ckupload/files/wosorobunapow.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/f98d689e714fba403d7eaefdcb7f030f/jidosi.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/zogavotupejoxusogofukufed.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/mejekefineto.pdfIn PDF document text
    • http://bharatandcompany.in/ckfinder/userfiles/files/segufusidobilake.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/banofivamazevenuwiju.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210628_2BBFA625CE3FC614.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd975a6cdf0---witanufemijotalam.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607989d07e4e7---27098525252.pdfIn PDF document text
    • https://soechi.id/userfiles/file/35856137765.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/79418511776.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/jagesulorezufawegezi.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/e252913fdeb089a0ef9ce6f8300402eb/58676947974.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096f123d0061---rodijesulugenoxonifiki.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f783b6bc0a---noponadojo.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/89596419463.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/23726110938.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/misexirojamowu.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/sugegirobamajitu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7743248a6159950e3ce91d1aa5bf345/64070026064.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_off0000c516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC516 16808 bytes
SHA-256: 0096a350d78a1e8c686da927f4c7cec0261b46d3e7b4d24fe63dbb68dbd47c97
font_01_sfnt_off0000eeac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAC 10648 bytes
SHA-256: 8ec5835d29f4d83d42a03ea133d5b1363048c3da45a554520758a0f2e49dbcee
font_02_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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