Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb02f125766c6c60…

MALICIOUS

PDF

81.4 KB Created: 2021-09-16 00:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7222ea1904db835ac6decfc867ca9de7 SHA-1: 0a7140da299971e5ad178ca149afd99e6e9ddcdc SHA-256: cb02f125766c6c60d50de5b361dc4f29ac6ae442ffd71b36484262f89bd570be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vegman-kzn.com/ckfinder/userfiles/files/37680487875.pdf In PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/829962897.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/40208735934.pdfIn PDF document text
    • http://vettercycles.ch/userfiles/files/vinigotefi.pdfIn PDF document text
    • http://www.pataniforum.com/admin/jquery/ckfinder/userfiles/files/77961599780.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/vifagujapariredu.pdfIn PDF document text
    • http://technocom.pl/editor/file/55439112931.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/domopob.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/1uvsbs7tcvvoij3knjkvt5ld92/fededigaki.pdfIn PDF document text
    • https://baglab.pl/galeria/file/depofezod.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/nikutapazelimodezujuwaza.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd5e4b87eab13bfa1fe45e364c29f76d/zulezatujad.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/ae90ki32r7fflrh6thaij2r0es/36519655017.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/197630e4e5801659d9ecf45b80d55d60/91622191541.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/fikizun.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/47356401945.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/32100880398.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/65270844423.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/mexunasepukiluteduvubo.pdfIn PDF document text
    • http://longarmquiltingacadamy.com/fckeditor/userfiles/file/19577991293.pdfIn PDF document text
    • https://dongphuchuytai.com/upload/files/riteruk.pdfIn PDF document text
    • http://namngonviet.com/user-/files/60850568019.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/54838485135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=the+trial+of+the+chicago+7+watch+online+freePDF 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_off0000d953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD953 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16A 10544 bytes
SHA-256: 317908570a8f6225730628cfe5171eda2639bb0755c4aa4411a3005e57ca264e
font_02_sfnt_off00010985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10985 17592 bytes
SHA-256: 8281c62bd74e12d031648e097173c8339acb6ea236213a0f3557c88daf8678c4

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