Malicious PDF — malware analysis report

Static analysis result for SHA-256 f86ef1fde1631b7a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-16 23:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 686a563e5b8fdffd3db222f91ee22949 SHA-1: 1d15245ad714dd99fd6e2b7f718bfd3f350cfe91 SHA-256: f86ef1fde1631b7a2b0c0520408aa0f97db7fcc023c081f21c9751cb4949c656
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

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://cructi.ru/uplcv?utm_term=the+hunger+games+pdf+book+1+download PDF link annotation
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408f1f8c188---tamodeku.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/71072641611.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/15212192132.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/17693904037.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/42092211651.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614339465086c---73629028082.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/97135979481.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/0f95f38e3ba6a990c721b312f1f116ca/36009472565.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/65324026449.pdfIn PDF document text
    • https://makenie.com/upload/files/gubenozatukezizameviba.pdfIn PDF document text
    • http://sino-web.net/filespath/files/20210902095405.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/80629360616.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16130976a13cd3---94960297549.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/88567771033.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/jojetabafi.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/35787613240.pdfIn PDF document text
    • http://ingegneriarossi.it/userfiles/files/79203410791.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613767050ddb5---476309144.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/3306468273.pdfIn PDF document text
    • http://avtosfera28.ru/userfiles/file/26166474044.pdfIn PDF document text
    • http://sinners-party.de/media/file/biregovebimig.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/dorovawubigavaku.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/59218833591.pdfIn PDF document text
    • http://travellerisland.com/files/90816506820.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/93255376327.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_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 11188 bytes
SHA-256: 315b0a426eb8aba366b8f392d83ae20fec2a22d4616819ac76b2ec6d70062d70
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 19312 bytes
SHA-256: 530d5f8d8af3cbd4c9eb706f1046d35ea6ff3c0b0191a6b43c5a0424db66f80f
font_02_sfnt_off00012cb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1