Malicious PDF — malware analysis report

Static analysis result for SHA-256 e99cb0b4415c3d62…

MALICIOUS

PDF

82.0 KB Created: 2021-09-11 05:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 77d7d350ef46a12d9bb176a9fd7816f1 SHA-1: a994b59dec384a49dc4758f5cef93efff907a5ed SHA-256: e99cb0b4415c3d6294f5350ab9037cc301ee41d2bfc74caf3453f02ee61288f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple PDF files hosted on various websites, including compromised WordPress installations. The presence of numerous links and the hosting on potentially compromised sites suggests a phishing or malware distribution attempt. No scripts were extracted, but the overall structure indicates a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f996e43f2f---49683148704.pdf In PDF document text
    • http://z-i-f.ru/userfiles/file/pefosurelev.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/dujikoreda.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/1985921544.pdfIn PDF document text
    • https://ptogel2.com/contents/files/xifujor.pdfIn PDF document text
    • http://eternaseguros.net/files/files/3102395050.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134bbf88e5a9---25818653303.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wirokutetid.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/16822156137.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/xusoxuxugefomoboze.pdfIn PDF document text
    • https://armature.ir/cache/fck_files/file/tofesiwonovakawefa.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/93805343070.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210908180014813.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/50000942805.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/xaroka.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/bosumatizalu.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/zalojema.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf9669249f---39513359341.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aeb8b1220c---xiboselim.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381edaebe46---kuvol.pdfIn PDF document text
    • http://another-partner.morefriendship.com/upload/files/wuguforexexodupususulikuz.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/21125181941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=notification+settings+androidPDF 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_off0000db19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB19 10580 bytes
SHA-256: eb935d121a26de3cdf005ff60825b309f516e7d8837a46e0354a55f93f35bc0e
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B41 18360 bytes
SHA-256: c61650de297d9fb83c7f48267bda0da5f72058744a64eba9e503d5c45a1d4687

Open this report in the interactive analyzer, or submit your own file for analysis.