Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bda060358d4e524…

MALICIOUS

PDF

88.1 KB Created: 2021-08-08 02:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 77c726197a32301124522aac16e37921 SHA-1: 6512271a0238e2d55bf88b57b137559471b366a2 SHA-256: 3bda060358d4e5240a2e47d64f63a39efab5ca96b6d56d769a99aff92dfdcc9e
172 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pistant.ru/uplcv?utm_term=4k+ultra+hd+%283840x2160%29+bollywood+hindi+hd+video+songs+free+download PDF link annotation
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093c9681dc58---repafuzosun.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd3d8952194---27589128097.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f112b3e21a8---raregiwovatasiwujeguxof.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/62775692942.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/e4aadb1872730b54bd501cad29cd8eca/vakala.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8997587da9---46900483919.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/5652312760.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/xubulatavunabanirasinu.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/cd6jpji86pn8chg67cnfllf7h4/tibupigimageromodevom.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/18330066550.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/vobaxofaxujizonoxunexikuj.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/96774946907.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/wimaxi.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858adb6a283---49578436642.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/viwusuxopojenelel.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/39644248858.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf44a5c52d---mopuvexu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/divexigi.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/38320553045.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d11150c527---fazene.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/9i72gvmeihsrgk7hf6em8eb6vr/givaxukadubop.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/linarabilakumi.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/jarafexizobimutixepanuf.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f12c5b8fa4---geniweriveb.pdfIn PDF document text
    • http://tvkinter.com/file_media/file_image/file/xijolaserediniv.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/15425881532.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_off0000ece6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE6 17896 bytes
SHA-256: 9a4a7ac891df4bffc1b25c4daa4c7181e087b5ea87289a2efe3f63d562dbae77
font_01_sfnt_off00011c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001342a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1342A 12312 bytes
SHA-256: a6844797ec58adaa7092124bbb2c0637a565fb2da06e2ee3b9ceb37eb2a1be1c

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