Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eef6991059c71e0…

MALICIOUS

PDF

83.2 KB Created: 2021-09-07 21:53:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 5d966d21abb227de7f937ad10d2eb09f SHA-1: 928638d99661ebd90a2de56e639ece5df3209b5a SHA-256: 3eef6991059c71e0c9df764d264c96e0960d4294f9efbd06ab198acc1ff2bfc8
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

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://1-sanya.com/blog_images/blog_/file/vumawusulofudujaluseva.pdf In PDF document text
    • http://chalappuram.com/userfiles/file/55719087655.pdfIn PDF document text
    • https://fallsplat.se/file/faxakozorug.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/59d2396b58ad6aca281f0a9d5ab1f08b/41446486834.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/038dd966a70416bb155affae55d85deb/timasibubub.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/jomipededisibusamaza.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/82550233170.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1fa9d1aae---68278507015.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021072712352373499.pdfIn PDF document text
    • http://lohsclassof70.com/clients/3/31/31ca850ff086a58b81c8700e10a01852/File/79798313741.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/31985208180.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/napaxipuxiwekezot.pdfIn PDF document text
    • https://sabunwangi.com/contents//files/19526428745.pdfIn PDF document text
    • https://5udua.com/contents/files/kasavenekexilafile.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69c574021c---88223352497.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/95d74122cd4a149b0a125702fd6dc958/67161536626.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-10/20210510014550801964.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8eff6a94d---51889237515.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/50831726113.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/dozoduva.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/webusokipedimage.pdfIn PDF document text
    • https://brtim.com/uploads/wysiwyg/files/zikuniliwivosudetixujesom.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/rotumulidewudutikegovewa.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/bumokirijuvefonojanife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=filipino+sa+piling+larangan+tech+voc+pdf+downloadPDF 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_off0000de0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0C 18004 bytes
SHA-256: 3ea544a8bccb75fde78b1a2e1e932a5d759f5d3241a0b0d2e2f303a3a5fd51d3
font_01_sfnt_off00010cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 11028 bytes
SHA-256: 4495aa21e3b463d7df3bc828474798cbf90d321a27f75dd6e0b8eea778d9edf3
font_02_sfnt_off00012624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12624 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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