Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c1b4f63f8e80c1…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 10:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b2d0280f5bae4a66d07194ee5cf6af9 SHA-1: 2fb987f776317596da59dee81736a8e8b20188c6 SHA-256: c7c1b4f63f8e80c12e661a1a8fa04f85cb027f529a0986809f8472f218257153
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary attack pattern being the exploitation of user trust through deceptive links.

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 http://bonezi.morefriendship.com/upload/files/45315333780.pdf In PDF document text
    • https://b2bircruise.travflex.com/bot/ckfinder/uf/files/faxexuvudam.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/xasibuzeranoxi.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/dokozoradefoborimaxuzuviv.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/42646585893.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/wokidufa.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/zemiw.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/39404175940.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/lewepozitanusizadir.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/20926419739.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/taxirirag.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/67809130870.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613148d52a02f---99928752801.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109101424467902.pdfIn PDF document text
    • https://vnjhanoi.com/upload/files/2494843009.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/95716191882.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe18994a96---77050001161.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/32798995151.pdfIn PDF document text
    • http://kubablimel.pl/Image/files/kavodimubakemexiwaguw.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/suviniped.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339937980b1---jibeziteterura.pdfIn PDF document text
    • https://askisan.com/upload/ckfinder/files/fobutowamude.pdfIn PDF document text
    • https://ms1oke.com/contents/files/21784055412.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/mewilewuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=the+tonight+show+live+streamPDF 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_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 19088 bytes
SHA-256: fc727871d072c240969e9d76ecdfec44c3d74710a9970a15893ecb626af4642f
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 10668 bytes
SHA-256: 4bdfaec68a0fbbd76043c901d1a288667197533e28a05a4afdc9b3603776043b
font_02_sfnt_off00011f8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1