Malicious PDF — malware analysis report

Static analysis result for SHA-256 b772901a96e7e57b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-25 22:02:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9361db40616cd0dbbb98dbecc09cd5e6 SHA-1: 30738f2505355bead176022b306332ed0c42d99e SHA-256: b772901a96e7e57b7a8202a81cc289629b9120070dd5e5e42eaa90ab824fff00
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d564d84a33---gidajufan.pdf In PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/517a71d78da3a119bb517729a0ddc61e/94477113869.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/19207080206.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613797ee6da24---53942731327.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210903/2309099620.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/zaruxinipowupotitiz.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/bogevuporikitiz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce65a260ca---gusoxodemulif.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/dilifekofuzuzawagofopi.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c9b29e6ec9cf1eceeabab572ad2a4e4f/vilikan.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210905000324.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/91324843796.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/80006312250.pdfIn PDF document text
    • http://smileorganic.net/smileorgfarm/filesupload/File/luledisudezasesumovev.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/fumafavevikizofuxep.pdfIn PDF document text
    • https://camelcarpet.org/d/files/xadekoviguxez.pdfIn PDF document text
    • http://beta-rc.com/upload/files/90573174556.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161489f3aa460e---giwotifetebegugozi.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/lugazip.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/xolotadexazezosolati.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/xonavivazojilif.pdfIn PDF document text
    • http://ashioke.com/images/library/File/79078738479.pdfIn PDF document text
    • https://magic-ray.shop/uploads/files/nawus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=windows+10+and+xp+dual+bootPDF 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_off0000b483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB483 10748 bytes
SHA-256: 5d4b935aa18fe5d881994dc5115202e419ffbf0399f1d5b459589bc7c8031d22
font_01_sfnt_off0000cd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2A 17700 bytes
SHA-256: 46d237bb90061de0e0d783d11e975b5c71810ae2c6c030aeca861750dc290bb0
font_02_sfnt_off0000fb27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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