Malicious PDF — malware analysis report

Static analysis result for SHA-256 08e6024f5ebd95db…

MALICIOUS

PDF

96.4 KB Created: 2021-09-06 19:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c25ac8d52a4ec620a8654eb014354392 SHA-1: 0157e78009b242ff5022d97959d8e64e9e4a295a SHA-256: 08e6024f5ebd95dbba1c053fedd6bdeb4371c1c16c1e8df0f0de9001b3d87ad2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm that directs users to multiple compromised websites, likely to host malicious payloads or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the nature of the link farm suggests it is designed to facilitate the download and execution of further malicious content, potentially via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://trexanh.net/upload/files/wezafi.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f4fb36145477f0e06667a400ce46a232/saluragewasomako.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/rewanidiwefemezorolowuva.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160addba7d90b1---sanubunujix.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/91874882479.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/qgo6h2116l9lo4cd4cvetcjmks/94888639854.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/romexefulumud.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/045869a5428a0f12687dcb749b90625e/33337993946.pdfIn PDF document text
    • http://cuatudongsaigon.net/uploads/files/gokolulidubizaz.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/4550de4fbb0842467af67958094bc066/sepepulanalu.pdfIn PDF document text
    • https://protum.se/file/78145135681.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/81893407836.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf6aab3d30e---60748604112.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160edd3b56f412---zolufovojaxetuju.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/69751991149.pdfIn PDF document text
    • https://ijfbacknumber.com/editor_up/tozetejej.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wetokatugid.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/46536125239.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/e8d067bcfee57468677e973a58da4401/nolasojoxolifobibasuxoxo.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/lobujan.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30722200066.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210715144343_1sh9ia.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=manual+adiestramiento+canino+avanzado+pdfPDF 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_off00010b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B9B 21464 bytes
SHA-256: 5069e343f281aab114857500be4f3aa6986374e11874314a3642eaeed1221a4e
font_01_sfnt_off00014218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A2F 11000 bytes
SHA-256: 040f087b5189d56a8c1a7e89cf7a1a53b54847b2ab9abb07679a5f8e427cbb15

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