Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad9b591409d3892…

MALICIOUS

PDF

71.5 KB Created: 2021-09-15 21:02:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4c16f0b22e684ee16d3e7d42b85baf9a SHA-1: a09ea546eb57725db4f28ca20b3514a23e58ff5f SHA-256: 2ad9b591409d38929d8c70ea4397a5d9eeb67cc50e03d97b390b1ed99cb4bc57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://chcial.ru/uplcv?utm_term=fnaf+online+free+unblocked PDF link annotation
    • http://szolnokepul.hu/userfiles/file/21390053263.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911002231660953.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/67614866579.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/vorubikatuk.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134db8be2f4b---nanuzimifuribewekovamo.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/49729473201.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/70316585431.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/nefikavikaxomutalagob.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/efp19f56cm1lblkecvd2n4h47u/78064869341.pdfIn PDF document text
    • https://tradingphrases.com/userfiles/files/zijipojezuxuwaso.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b88199d3d1---77768541874.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/53086814908.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/bovifedezaba.pdfIn PDF document text
    • http://pk-rowery.pl/user_pict/file/mebej.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109090703335397.pdfIn PDF document text
    • https://n-tlg.com/files/file/1599758089.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/51143151597.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/85151307757.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/94778863198.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/73890303617.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/61417538234.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/47554332207.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/53920552753.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/dixokopesap.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/38608733556.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/15397509473.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_off0000b5e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E5 10512 bytes
SHA-256: 3f46b663dce4cce2e2f747005a10f2b216ca53d4123a36d09b08957f80e26a42
font_01_sfnt_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 16620 bytes
SHA-256: 03cf81b3e986eac58c791cd39b4b2305800b9ea90da97955d6b50bb5efa0e693
font_02_sfnt_off0000f87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF87A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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