Malicious PDF — malware analysis report

Static analysis result for SHA-256 7513ecf167efd6a7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 21:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fa7425447ca848b942dba6b6b1576a8 SHA-1: 48bd276199343b25c82079b7cd47cc3032824ad6 SHA-256: 7513ecf167efd6a7c14674d6446053d5bfea437edf3f9f52cbe1c2aaad3bfba1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF is flagged as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan delivery mechanism. The document contains a link farm pointing to compromised CMS uploads and disposable hosting, likely intended to trick users into downloading a password-protected archive. The presence of multiple external URIs and the 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggest a payload delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://uroci-kursove.com/userfiles/file/jiniwakelup.pdf In PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161390558e73ee---fosaxuniwikubidoxejisim.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161342b4f79a54---25417402597.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/46528286447.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/wakumokew.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210911233217.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/fabebatokuxutoletonusomi.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/mirorokad.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/nejejuwox.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/82578668454.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/40541645548.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/nodin.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/61501583129.pdfIn PDF document text
    • http://budapesticukraszdak.hu/userfiles/files/12378001820.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/fefemumafolutixilava.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/zogidokupemamezejugup.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09de75f1d---88640532476.pdfIn PDF document text
    • https://vienhung.com/webroot/img/files/vokebijuzotogetonutixeji.pdfIn PDF document text
    • http://el-master.ru/userfiles/file/79862334989.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/94892810357.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/dofegebufibibefuzetitot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=most+difficult+pattern+lockPDF 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_off0000dc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC31 16764 bytes
SHA-256: a08a0caaa903445f7f5b9f8064783899bbc1569e9040c1260a5822a8e9cd93f5
font_01_sfnt_off00010790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10790 10800 bytes
SHA-256: 98f5b8fd88acf2236a92e1bd6a3f7f0fcc82796ef33be0f08f06088190eede80
font_02_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1