Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac2b5979431d7d55…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 10:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 51367db38ce5e91977599f43cd24c071 SHA-1: df3ff6ebd991b5a6241aad3706f3bad7f8df2eb5 SHA-256: ac2b5979431d7d55d1e5b2abcdef9fc5f5d4e601b36d1b1921c64e63138d11cd
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, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple domains, some of which are hosted on compromised CMS uploads and disposable hosting. While no scripts were directly extracted, the PDF structure and URL patterns suggest it is designed to lure users to external sites, likely for phishing or malware distribution.

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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb8aece2d2---97413590587.pdf In PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/4976529635.pdfIn PDF document text
    • https://ms01bet.com/contents//files/pusavedugudukedizud.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210524083806.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/kodulositegumusonewota.pdfIn PDF document text
    • http://polletnv.be/uploads/files/57636410942.pdfIn PDF document text
    • https://rintrans.com/files/butobuzesasanon.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e021dc169---bedilixoruma.pdfIn PDF document text
    • http://kamienneogrody.com/userfiles/file/50531518791.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/19016402141.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202107080100335837.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/kizalogulega.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7836ab8ef---83937735986.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/47fa3c4aefc269777239ca8b263290db/jubojokokilisuxabofamot.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160786dd0a3a6f---tikadenelenuxomirorata.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/26719692468.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/gopasijo.pdfIn PDF document text
    • http://smith-williamssisters.com/clients/d/dd/dd6cbc7353a6ef31c13ccaa63ab862ac/File/nafumogugiv.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/23605668286.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/d389d8970980379eff44ad37aee10e03/5011931188.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/19015952006.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file///bogakasuwubot.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/lesuj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161233eb09384f---jebukolar.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/koxododakuripubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=beginner+home+workout+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_off0000dd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4B 17676 bytes
SHA-256: b7ff6a90d0d683235ad7418c697ac1957ce519c7085acec2d60a5e80eb1dce50
font_01_sfnt_off00010ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD1 10900 bytes
SHA-256: 17d2696ed6ab6c9c411fd54acabcff47bc6dd0d4b720347492399e6d535e5ddc
font_02_sfnt_off000123af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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