Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfb6397a7cc59bed…

MALICIOUS

PDF

98.2 KB Created: 2021-07-13 06:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 146d018c96bfd3e65b534c0a4819dc6a SHA-1: a960f99eae145a41e0f87c8c3570b80b1660fef9 SHA-256: dfb6397a7cc59bedb572bbfd73c23f710614155efc63981912d621624c0a8f3d
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The embedded URLs likely lead to phishing pages or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://infrive.ru/uplcv?utm_term=smallest+amusement+park+in+the+world PDF link annotation
    • http://avandcie-automation.com/ckfinder/userfiles/files/8322693843.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b300d5103---18394778965.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/jujamupetefudebomen.pdfIn PDF document text
    • https://clinicscrm.com/img/files/zunojepemuwuwowodobewul.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e15a6f3483---losuwowetodopotodex.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/19757741005.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210624061722197.pdfIn PDF document text
    • http://dothi.info/images/files/24450337778.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f8ff050b81---32663861073.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/56317196642.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098713fac4cd---vavafomekotirugivurulux.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/64756423881.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852fc42489f---puxuberaz.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608976d564bb5---60832197944.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106081841.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160743b33a80f9---benop.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b96835b2b334ca1f78cf6e1a4db7dae5/fazokejuxufetewujosolipo.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/e8019ce02f6ca30a8a0129a496f1b92a/tekozuwigijibuxakuze.pdfIn PDF document text
    • http://www.bash.cl/media/file/6263552178.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c220ed906---tozudupavimanogonoxi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e434fb7171e---tenimodujefukuzesal.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/ralekupovuvevazujavo.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8d261965e6dfff3f69374b053b89e1a4/13699735351.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-23/20210623184400793064.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_off00011c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8C 17508 bytes
SHA-256: 9abdc6043dbec1b9d793dc261baf51fa7f627fa5f459cab458b6bf24d9a8966a
font_01_sfnt_off00014a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016231.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16231 11008 bytes
SHA-256: 58664c465892f2171683071119c1eb775eb98639634fc91df1b872fcaf4d8576

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