Malicious PDF — malware analysis report

Static analysis result for SHA-256 77783d594fadccff…

MALICIOUS

PDF

88.1 KB Created: 2021-09-09 06:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b32d2d56e43c0bea71779a1cfe6d104e SHA-1: 4e7d72959eb2e87fc5ca5291c5864f13820ba0c9 SHA-256: 77783d594fadccff2f7fdd4b21895f2be1eaf9c4b5d1eb89539a176e591ef484
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or domains designed for link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of 'utm_term=download' in one URL suggests a lure for downloading potentially unwanted or malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9850

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://xsteelstock.com/d/files/paxegipoketudo.pdf In PDF document text
    • http://worldprint.su/userfiles/file/fexobobumikogu.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/negasajimev.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/35667763921.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/kuxupotuk.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8bf27ece---53540494794.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210902200721.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/mikumofatelepivikopup.pdfIn PDF document text
    • https://shunnasato.com/32193099420.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/jonetagabefitu.pdfIn PDF document text
    • https://quizai.com/uploads/files/29705269235.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/1596354834.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/99010613509.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163098982691.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130714fe26c2---57936022433.pdfIn PDF document text
    • http://shahgrp.com/uploads/12026108611.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/zaritaretoxamitivipoz.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/56384484707.pdfIn PDF document text
    • https://esz.jp/img/editor/files/85161744577.pdfIn PDF document text
    • http://belv.ru/userfiles/file/kezasubedisifivipe.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/tigawevibadivesilifisof.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/rijip.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/280175440.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161327fc57e942---94736705233.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/2469653169.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+yu+gi+oh+apkPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 21308 bytes
SHA-256: c28b9c21bd83fa4a85b9d476b0ec74aa2e419105563625bb0bf18e2781a01b9c
font_01_sfnt_off00010378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10378 16364 bytes
SHA-256: 2afd9454e807ef98c0498fbb4d1794ae2525cfbd5a9382095847bc0998b29090
font_02_sfnt_off000119ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119ED 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off000121ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EA 10568 bytes
SHA-256: e671271a74505408d8a537985588cb4c074a530ba1ba9a93d819d8ec07c18ca6
font_04_sfnt_off000139b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1