Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad595826e945477…

MALICIOUS

PDF

99.3 KB Created: 2021-07-22 04:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5cf9554817b53582a8453597f1784611 SHA-1: b5ff8b0611c8c8d5b153782fa9f68955f828bf56 SHA-256: 1ad595826e9454775b54635e40325ac4cb9cb8f26ac92bc381cf6e593c8439dc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised or disposable domains. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tara77.com/clients/46590/File/xuzagobebi.pdf In PDF document text
    • http://www.addvanceo.info/userfiles/files/62445277225.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b95ee989ab0---93646892573.pdfIn PDF document text
    • http://carolstoecker.com/clients/c/c6/c60e280709801842a26e47e23f21f170/File/vatalem.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8506dfb2a---minuparuvot.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609139a6b270c---48155607082.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e5656097872---kajebugivixame.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/80541424564.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/91711743845.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bce86f7b8d7---zomavex.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/wutugoxovanenusi.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8feb5600780815600728ee7d423ece01/56077396879.pdfIn PDF document text
    • http://studioguatta.it/userfiles/files/dejerejifovuxokowos.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160847172a562d---pisubek.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efddb07ef2---6090840000.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210702074650.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/59518583779.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b559d804eafebc74a41578e6196bf71c/jirisal.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0f1f4fc7d---dotipexebamoxolis.pdfIn PDF document text
    • https://megashina24.ru/files/files/fuviwifemutaziluteloduf.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/192cb0a9e2f9f9c6859f1c5c99d15fde/88670745994.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/60231607886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=overdraw+bank+account+meaningPDF 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_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 18084 bytes
SHA-256: 24c0d63aef4a175bb6463cf48b0ecf739462037a118b2b6379c9dc15cd08cc44
font_01_sfnt_off00014c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7D 11008 bytes
SHA-256: 5c33cab451429ebc38970be5b405fa45b2dc1c5dc902ef1499c1bf0ce4174d30
font_02_sfnt_off000165f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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