Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5db0bf14550e407…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 14:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3754f0f7dee220e7ead8db9b8f1340d4 SHA-1: 24ada74181efb38377b0c26bae31a9c6c80431b4 SHA-256: a5db0bf14550e407dcbc7dd60f92e13e67c1eb38075d25021f988f6e88ea9956
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to redirect users to malicious content. The presence of numerous disposable hosting links further indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nakatarikaszel.pl/app/webroot/userfiles/file/fogopolajajafivezajise.pdf In PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/zomagaxaxek.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/vitunure.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/xupiparelalunevujojijuju.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137d272aea0d---83398200353.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/sipejejagabujopezazuzukaz.pdfIn PDF document text
    • https://kimansion.com/uploads/file/nusoronuluguzofipe.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/93e32b9dd2b60c852808ebe30813f8ac/6504600536.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/17167126188.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8bf4a6ae0---losajev.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/19465827298.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/jumokebazoxa.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/migibitegabupotobubufado.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/53049779833.pdfIn PDF document text
    • https://www.delaneyllc.com/ckfinder/userfiles/files/30756289151.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/nirafobinu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16147a12936c08---legobelisupoxowa.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/nanezilodikusuzu.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021928131304254.pdfIn PDF document text
    • http://robbes.nl/media/files/19151193798.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/xupeloremoxug.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210921_B58B5E9FA67BE034.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/98614828290.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/39007749002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=come+trasferire+contatti+da+windows+phone+ad+androidPDF 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_off0000b2ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2EE 10956 bytes
SHA-256: b942a147aa2cf4f650cb55572005d78583fe3d7ae4cf94e6c53c8d6e1f40306a
font_01_sfnt_off0000cc3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3D 15484 bytes
SHA-256: 6f1fd21dd917c99221a6a165a5dc05d525ef9d22628eb25cfaa1427919d98c55
font_02_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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