Malicious PDF — malware analysis report

Static analysis result for SHA-256 07cf8ada33b32675…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 17:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a162ec63fbbdd787900aaa253e5738a3 SHA-1: a316fab888532446b69ff81b9fd6d42b699cfb80 SHA-256: 07cf8ada33b3267565fc5baa305476762bda6a4de8e06ca3daf8e471603f539b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, including links to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://actionsporting.com/userfiles/files/62112305957.pdf In PDF document text
    • https://beauti-full.ru/uploads/files/92308131811.pdfIn PDF document text
    • http://fcvperu.org/data/fcvperu/userfiles/file/67371607134.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443d4e06c3b---74184458137.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210906/210906184543685282fmf0iw741yy9.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614d37b74dab7---74711225852.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/ledowab.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c6cdb0cb---81942270986.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/6212751281.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/rabopatogelekoragil.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109240801565680.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5b9a50fc1cf8f7dcf952fb9bc83f59ff/gerulotuxawikolupifuka.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/nezesopusudidixixe.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc9f83b538---wakefebukesuwezakigiwuja.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/53139575985.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/litimeg.pdfIn PDF document text
    • https://khanikango.in/file/xibelinofifawasaxef.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/lemir.pdfIn PDF document text
    • https://adproissy.emailingmanager.com/uploads/editor/file/53273754581.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/28398708852.pdfIn PDF document text
    • https://amthanhanhsangchinhhang.vn/upload/files/bugapo.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/65307991556.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/5661440520.pdfIn PDF document text
    • http://dalaichau.com/files/62604096108.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=the+world+is+flat+summary+pdfPDF 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_off0000b0f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0F5 10920 bytes
SHA-256: 1302ba25becbc8fa16b7ddf22491473e988f8b6950320610eff490b4650dbcb8
font_01_sfnt_off0000ca58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA58 14944 bytes
SHA-256: b01f9f7c9629eb3dcc2b8023a8be48b79993c432670f364877f4dd62fe7475e8
font_02_sfnt_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1