Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3715ca002603d7e…

MALICIOUS

PDF

94.5 KB Created: 2021-09-05 02:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4eadadc621769e4f445cd1edfef27e4d SHA-1: e0f8332e19010f6d5b4cc9f568bff84ba0ccb1f9 SHA-256: f3715ca002603d7e68e44ad18646e2d3a31db6ba0e616c5cfa09afb75600322a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure and the presence of multiple external URIs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://laborke.ru/uplcv?utm_term=toracotomia+cirugia+pdf PDF link annotation
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/51ccd05d49e93c84881339045e85248f/wesejevotanase.pdfIn PDF document text
    • http://springbook.no/files/80642646474.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16090cdebe01de---19449844793.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/76870723890.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074951f93af4---21945899575.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/8f02ad0306ed7149b42690758ed9422b/zojakekawakaxugedodurok.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7256fb2b06---dujenamejunusodudalujomag.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/maxorag.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/44617771201.pdfIn PDF document text
    • http://elitakhealing.com/ckfinder/userfiles/files/vizagofawetesejebimiziwag.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/26109776845.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4322db543---sanalorer.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/93551517833.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/72349806606.pdfIn PDF document text
    • http://blueyee.com/upload/file/070756195642.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/4476293428.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606d076337450---73984222267.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/gowemodimupisatitunolep.pdfIn PDF document text
    • http://cycling-software.com/files/file/tozagewi.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/33669949432.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f3b28c22eab---migoxolutufovumataxo.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/kerexip.pdfIn PDF document text
    • 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_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12398 10576 bytes
SHA-256: ea46abd50c9db345a70cc5071288894e4d366681ecb45a84d08b1243f706cfa9
font_02_sfnt_off00013b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B89 18812 bytes
SHA-256: 83e7ef57eb53581f3f8e4bba25dad958b4e63db8cae14b5f0fb376e38ada0dfc

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