Malicious PDF — malware analysis report

Static analysis result for SHA-256 13c04e98dfd129c9…

MALICIOUS

PDF

83.3 KB Created: 2021-07-18 18:54:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 82f5ba7f0321c38a391d56f4024aeada SHA-1: 959c9e7fb53d9f5b69585c1072db8c99d337fe73 SHA-256: 13c04e98dfd129c9bb07593ed1fae8630c6fdfef7401b003cc285069a2fc84c7
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely serving as a distribution point for malware or phishing content. The presence of multiple unknown URLs suggests a coordinated effort to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e01d525d862---miperipalirinetagox.pdf In PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69e1d86c8a---16025441240.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/86944146927.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/98462672667.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/2371441626.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed3e955691---91979303131.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16080523cd4250---79834970220.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/49480806887.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/77145714937.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01f4992cbc---71004208593.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/8lgc7pnptogu02cfbndbqbhsea/63450807466.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/3a469d435a48c739d48eef599e37f3bd/73253397592.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/sf4jcqsa0t09n2970bufqhv4k3/4584168968.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/43521432450.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160910942cb7b8---lofutepawimefof.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/83747903627.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c38c2c41490---36532913854.pdfIn PDF document text
    • http://jdhs77.com/clients/58520/File/14178962065.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/gusiwidugadasofogeki.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c38392bb34---81122069883.pdfIn PDF document text
    • https://metnar.pl/web/uploads/files/82066477061.pdfIn PDF document text
    • https://kurtoglumob.com/upload/file/3283395084.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/96399385941.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/36883634519.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=anderson+stripped+upper+blemPDF 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_off0000df42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF42 17800 bytes
SHA-256: 9027e6a592b54599874b52c79fdf4b0c7f7c5d80b16dddde85022e9a5bbf01fb
font_01_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 10612 bytes
SHA-256: fd1ed9968ade543f3587d2b78b21377fb3d0fc7c5cac72e7f34c5dd998c48aa2
font_02_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1