Malicious PDF — malware analysis report

Static analysis result for SHA-256 9450d9fd477b716f…

MALICIOUS

PDF

92.5 KB Created: 2021-07-31 22:46:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e460dc105a1b464e70907f41a6bb61b9 SHA-1: 25d9121c2dc1c738a831968902daef8e443c79fc SHA-256: 9450d9fd477b716f8e8905b651106d0b17bd5346131f50bd4d72c427fad64cd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080908503d73---92210614770.pdf In PDF document text
    • http://sosnovgeo.ru/userfiles/file/pudosuxiva.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/xujosubopupajuxonuzewe.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/kt0urcsndja2hi9bne7ljnu2f4/12677166993.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/sabc0m64bbkm4g4kfvgpfn12r5/sokomi.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/4936793942.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/didosupitato.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/lijaxofubidufakosifebek.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1e8b864db---kutew.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/popenizujozitomo.pdfIn PDF document text
    • https://www.makathastaliklari.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076cee42c331---20093880952.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2381d87d3c9e8b516e6525cfe397f276/seporirodusa.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/tufegitezidesetosetodom.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/vagotavi.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/vosaxumew.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/82111453076.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/19027717570.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/47d203d328b02de2926122975cbd6ec2/51521266193.pdfIn PDF document text
    • http://vuason.vn/upload/files/29533546551.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/86041340195.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3441c1f19f---12115805740.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0794c012d2---90695881284.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/78665296597.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160724eb2db3b4---74537399897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=electrolysis+at+home+machinePDF 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_off000106d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D7 16932 bytes
SHA-256: 6fda41c60a65ab59be211160be792cc0e9d51c83817d45710bba5c13d355cb86
font_01_sfnt_off000132e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E7 10592 bytes
SHA-256: c9968e3997d1662098bae2e88afc6c0d7be2a8636bbd5bfdab7a5b53137f0fa5
font_02_sfnt_off00014aef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AEF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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