Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9dbbbe1dd4d6f87…

MALICIOUS

PDF

488.3 KB Created: 2021-07-13 13:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f162ce452547fde6dd51d058c960f8ea SHA-1: 8f24cbe6e6320c1bc42ffdf64a89d59fe0c84386 SHA-256: b9dbbbe1dd4d6f876506d5aa9a6944edaf97565f1215b03d21585b11071f13ea
174 Risk Score

Malware Insights

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

The sample is a PDF document that contains multiple links, many of which point to compromised WordPress upload directories. The heuristic 'PDF_SEO_UTM_REDIRECTOR_LINK' indicates that one of the links is an image lure pointing to an SEO redirector, suggesting a phishing or malware distribution attempt. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the presence of numerous suspicious URLs and the compromised CMS upload links strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7030

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://medvor.ru/uplcv?utm_term=pokemon+ruby+cave+map PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606eedd7a0d30---40577692458.pdfIn PDF document text
    • http://ping-property.com/user_img/files/tazefaxoxobogixomariz.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/976a2eb8d500fad297b1dd24074b04ef/dasiv.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/2963a76a51fe85435323fddbf755ed15/97251796648.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/jogawa.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607309929f179---fesanim.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/88610865472.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/16760562218.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f308e4e48---67332909056.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/27648944446.pdfIn PDF document text
    • http://visit-pune.com/userfiles/file/56440904114.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/36357797489.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/xazuzubejafizalafitadat.pdfIn PDF document text
    • http://lovec.bg/root/ckfinder/userfiles/files/wazeji.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb5e51f405---legixulukeludosovupesajod.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/pawujexukudawetutiloson.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7bada9b105c72ab2855f0342bfd7c2bf/jikoxagamamodorubaduwozon.pdfIn PDF document text
    • http://gillyard-johnson-mahoney.com/clients/62114/File/409106209.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/24021597413.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//78156340079.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/v25n55i6lv4dpa7a9gh2kf8ph6/fizido.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3c2b9f535dee37da7a6f39e3baa79347/kesusududimanajorusoxod.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/posobifibaveno.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/89e40f456d06795212cb93398763a65b/fogomazewapezigur.pdfIn PDF document text
    • https://aokman-drive.com/d/files/46767716471.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off00072361.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x72361 23184 bytes
SHA-256: 3675b85e20659b1a817fd6ec4479249f2ac24089162318b4ef48eeca67ce8d09
font_00_sfnt_off0006d227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6D227 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0006ea3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA3E 10644 bytes
SHA-256: 913e5cc2a244d1be8212f1e671a02de17833d7ece2b8c53e1a1741e59169b972
font_02_sfnt_off00070266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x70266 9940 bytes
SHA-256: 84a57db78be7c7b914e9b86977d31042db55eaff388dbb7c9398cff2fb870c84
font_04_sfnt_off00074f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x74F59 25388 bytes
SHA-256: e760c52125e03d613609a7c059910760b21c5ebf017cb45839b7de99931e1117

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