Malicious PDF — malware analysis report

Static analysis result for SHA-256 42b0a8091660a008…

MALICIOUS

PDF

80.3 KB Created: 2021-09-15 11:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a6298db00e3291e157f0697e4d5377ad SHA-1: 202bc17b120a30156f7736b18d8621cc486538f5 SHA-256: 42b0a8091660a0084a9863a3491412cec6c1342a83307a45c7599c9ae6539f6d
156 Risk Score

Malware Insights

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

This PDF was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised CMS uploads or disposable hosting, characteristic of a link farm designed to redirect users to malicious sites. The presence of these links suggests the document's primary purpose is to facilitate phishing or malware distribution by directing users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://2sisaccount.com/userfiles/files/novarasago.pdf In PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418c2bb747a---jodamokevanuvugunusemilu.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f97f6ea90---70558517140.pdfIn PDF document text
    • https://tmtteks.com/files/mabelanufixatifetezaxili.pdfIn PDF document text
    • https://riwg.in/userfiles/file/87601919653.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/23150345810.pdfIn PDF document text
    • https://dodatkireklamowe.pl/web/uploads/files/16918137253.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/kaxurelukabebalo.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/78525564852.pdfIn PDF document text
    • https://syteq-pro.com/userfiles/file/78974988985.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/kudakapapurumurifitesoba.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/99604093117.pdfIn PDF document text
    • http://aleshashop.net/uploaded_files/userfiles/files/3041588380.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2e19pqrcdrvehoar3gonqn9kb6/35730318117.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/bimaxujatokareramigo.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/dj14jlaevo2sea28hogluh4jpm/89050179593.pdfIn PDF document text
    • http://annabarons.lv/files/files/lotujuxenagevugovabevaj.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/33170463436.pdfIn PDF document text
    • http://thecuriosityshot.com/39611260530.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/baxifavixisetis.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/26842749463.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/3gdqgpno36vc638878ikdo8ll5/13860626658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=apk+downloader+for+pc+windows+7PDF 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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 17432 bytes
SHA-256: 6b6b3583664a2a79127ef972678c2318dd3c885854647235cd27cba93328ad6d
font_01_sfnt_off000102ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EA 10724 bytes
SHA-256: f67f75b4fb8ebfe7499181aaf8d69e925ed690d37851fa78619a2175c0230a68
font_02_sfnt_off00011bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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