Malicious PDF — malware analysis report

Static analysis result for SHA-256 2294f42034f649eb…

MALICIOUS

PDF

72.6 KB Created: 2021-09-16 15:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1115970b16abf8acb180b1590dea3dc3 SHA-1: be59d5eb881eb49d62fb7519e72af9c0e2df4ca8 SHA-256: 2294f42034f649ebd2ddb7910cb09dfcc146ccd1c6981f19545d2d4ace5b0992
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to exploit vulnerabilities or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://irlanc.ru/uplcv?utm_term=how+to+cast+phone+screen+to+monitor PDF link annotation
    • http://shijijiaming.cn/filespath/files/20210906053739.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///bosirow.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/munus.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/50256467955.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/vekowujuwil.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/muwowadotirawoz.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/purobadulusijexivuwulolip.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a076099641---19944528141.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/judibazofumirugodetax.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/c139aacde5ec3817fb7e1548b93139b8/16259598079.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/48f61fef43a58ad34bb24a1c0b75e88c/fikirorizukefofulesax.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5084b3ba9c074881895681251ba4b066/72605741093.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/16831918105.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/woniwubifosogizami.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8c1c3ee9---73325936548.pdfIn PDF document text
    • http://elpijisystem.com/file/66510195633.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/38628783060.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/posabaparudalep.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gizapeluranex.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/dixigi.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/89553772875.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-1/20210901120643993496.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/lujogijakagelezutomobok.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/viwosu.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/35743912884.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_off0000b94b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB94B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d15d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15D 17044 bytes
SHA-256: 6bdfe148524b7e009db1ddb7a71cb249ab208c8b76c08937b0e9c9ee2bc1a448
font_02_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 10672 bytes
SHA-256: cc22cedf321cee565eeca731f90c41cf077bf97667a6b21abb2d8d5692563ee6

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