Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f7617f86e76e56a…

MALICIOUS

PDF

101.5 KB Created: 2021-08-20 15:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dd5aed99a990eeba5a2b87367334e2b7 SHA-1: cf837bc85843f3b5c679c708f820c3bd9e42656e SHA-256: 6f7617f86e76e56a33dc011f73030f96747dca6bda394a59188aa1404d1fc7f0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, 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 related to phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://ediljolli.com/userfiles/files/nazedo.pdf In PDF document text
    • http://palenice.net/obrazky_clanky/file/xuxuxeso.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160825bd291837---65417370579.pdfIn PDF document text
    • http://st03.it/userfiles/files/40954136573.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/a4e11ccb47eb651fa2a83070baa4700b/27363345183.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/piruwanabemeluka.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608996f0be6fc---65713850598.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9269cf231---jozofibolozoxudofar.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/38120010604.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/38490135837.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/bl6ts4djln33hl0s7a5g3mqmt7/xexanaziroziv.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083747801d2a---wosisuton.pdfIn PDF document text
    • https://digireg.it/upload/xezelivepokij.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/23991372623.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cbcf79e2c---fowij.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/55174f7484706d49e513a825afc0c832/564287363.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c8b655597c---18762621733.pdfIn PDF document text
    • http://btc-ltd.com/upload/file/70621282027.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/daa6d988e9f52fd09985e9ea1709317b/72207418056.pdfIn PDF document text
    • http://wrhs1976.com/clients/0/08/080801f2a31a95d446b71e9836a5425d/File/ripobamaramikalevazolifus.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/fojoxapevipoxejagilo.pdfIn PDF document text
    • https://masihpt1.com/contents//files/mujasovedolofakimovoku.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/116f6f7fb99d0f4f1e3c31d03720afa4/kajajo.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/0lgpm0rhhe1uek2pffo23d5d4u/fosuwisajokuki.pdfIn PDF document text
    • http://gilbertthomasreunion.com/clients/5/5f/5f56fe696be94dde62972871c8a9bc28/File/69745999863.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=american+english+file+1+workbook+answer+key+pdf+free+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_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 11432 bytes
SHA-256: 5b6071fed8b9839487278497bcc67e6193829ade223837a1eed4e4d91d8cee30
font_01_sfnt_off0001290e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14120 27180 bytes
SHA-256: 199eb699ee4ad861a252a165091e5700b7ac53dba7b6a3d1670f869b9a6d2691