Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9ca573cdead43a…

MALICIOUS

PDF

87.4 KB Created: 2021-08-03 20:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cadee4b13c63d49d3c1c1e8e82d80540 SHA-1: 759bd2897acd3761cdd72d75a327337336a5fa9b SHA-256: 5f9ca573cdead43aec47a41230255234b7be9c7d2f99ccf396f625eacb0734c9
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to numerous URLs, many hosted on compromised CMS uploads and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://mwflower.com/upimagesfile///4707285880.pdf In PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9d214d507---lafakuxuvogizat.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/230fbc2599d3ba716cbd4f48a6497e55/94443378455.pdfIn PDF document text
    • https://mollis.rs//files/79598799457.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/86628625260.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/sokoraforifutenepo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085581c29923---gunubufamalal.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/60969351382.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071658f40160---53749516227.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/fimidawiruzidesixiwuz.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/c171b0e9e25dceffbb10e5c1b1466d86/polowexo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca8d6ee605---57226350619.pdfIn PDF document text
    • http://futureinfashion.com/ckfinder/userfiles/files/63630444974.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/9445207990.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/wowivobowi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609118c212e07---60393946626.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/58373710343.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/48657422999.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083ea11ce1d5---gejazazoni.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/jalivegirij.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/94954873479.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/76331643714.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/vuvafinegogorukomijapewer.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/waxuge.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4750ccb2b7---sodalejilo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ue+megaboom+3+charging+cablePDF 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_off0000f310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF310 10732 bytes
SHA-256: 5dbf8949d08063b2c46d4d6c22767a4cd5e5b28aeced77d874acd085a6ce5d65
font_01_sfnt_off00010b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7C 16844 bytes
SHA-256: 1f974340cebb3692813ad6104069fa98dcc13f90fb41c34918fa773412270531
font_02_sfnt_off0001377c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1