Malicious PDF — malware analysis report

Static analysis result for SHA-256 505a836333b53f9c…

MALICIOUS

PDF

87.8 KB Created: 2021-08-11 12:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df14e017e2753cb24ac2988e7c17d82a SHA-1: dc7e27303202d69d3a7f8224442ec60b673e6fd1 SHA-256: 505a836333b53f9c3ca1771e3351b92cee93608f8fe84768ad9bdad9f424efd6
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous websites, many of which appear to be compromised WordPress installations or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or SEO manipulation, rather than executing code directly from the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jentretiens.ch/uploadimage/29925029721.pdf In PDF document text
    • https://12tiga.com/contents//files/rubupufinonerupaf.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/lanixufotuzapinube.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210608214953_423097086.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/6v180vmu6vo0n29j1s6g2tfn2d/30445024089.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/04dn5ft80ob5i3s6hhvdbgte6j/saborikijonubopu.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/jdkb1528hva8tcopa24944aiq2/39083385788.pdfIn PDF document text
    • https://imaggu.com/ci/userfiles/files/luvaregudawosa.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/p89c78j638mp1keeubvpmuvtkp/46906958610.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607947176670c---pesibaletixurap.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/23964612894.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607971c198c1e---3053269752.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160773c0e28434---pevaduwuvo.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/patevatif.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dce3292116---5127036793.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/52426772357.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c50c770c2---zibuje.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611271c8152b3---8362080384.pdfIn PDF document text
    • http://toddfamilyreunion.com/clients/4/48/482e924d5a052aa4a0c13eb8a30e0bc8/File/fexasoxutere.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16072c7f97304e---99342708856.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/lovexopibisojitodidefawa.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be60c43f56e---64627231278.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=programe+tv+romanesti+online+gratis+kanal+dPDF 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_off0000f346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF346 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B58 17380 bytes
SHA-256: edd2fcba69d5a9483195ed84805429e606f3dd3e92adfa485cbaf6879044ef87
font_02_sfnt_off0001384b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1384B 10748 bytes
SHA-256: 30779095a8488a165006e7c5b99cc4a8624aa965857c2603c853537f61af2026