Malicious PDF — malware analysis report

Static analysis result for SHA-256 d494b268086a62b4…

MALICIOUS

PDF

81.2 KB Created: 2021-09-07 14:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3805b58d0fddf9c89a26bfa824f0d003 SHA-1: 252f3f769bb24beaba207a621b02c6b84a6cf5d9 SHA-256: d494b268086a62b480f59957354e567007d45d362f183e9a9a6113941856f01c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded URLs indicate an attempt to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://infrive.ru/uplcv?utm_term=trumpet+warm+up+routine+pdf PDF link annotation
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/721f0ca6e4fc9d8c353e0b1d1d6d10f6/26738062941.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/17d577874e3f4270d5d895a0e974d974/raboxem.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/suruxukomaj.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/694drdcbtjuqoj62m5olvu3av7/67713944459.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/lezetatovivusutowagilubi.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160927af6e6a74---lujok.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/pixanopobovexulak.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/d8309fd9b508c5ca680fb62c5d98de87/1981311934.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/21908561264.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210619_525624A63FDAE807.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/juxupafumadig.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161248ac24adf7---51490169802.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/54c6bba4d7aee42c38313b943d31c713/74926112847.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5e479a370---11227440854.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/1bfa8033fc59bff11b00d238b0aa99ae/96519432539.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609acaae66c59---77719592763.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-26/20210626094254149697.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cbfa7d73d---5980927844.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16086f79c5d03b---57880532013.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/zujomopobawirijega.pdfIn PDF document text
    • 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_off0000d72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72C 10596 bytes
SHA-256: 5524297f98664d7b08ecc33ae5ef5ce475e4aa03b30a3c10b724aeb02140f6cf
font_01_sfnt_off0000ef65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10777 18484 bytes
SHA-256: 4e4fda3ddcf43d5ad3444fe95b0b5d7eb8ed58edd2217ae08fd11805b7197504

Open this report in the interactive analyzer, or submit your own file for analysis.