Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0df62a2564c847…

MALICIOUS

PDF

76.9 KB Created: 2021-09-06 20:02:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c73ce1c9ebb33824eaaa1470cd011c76 SHA-1: 52b55286e0c495bd96ef3edf079f0e0018145f52 SHA-256: cb0df62a2564c8477fbfd5142abdfa915ef5aec6de844755ad53fb7f30abcdea
156 Risk Score

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=rudram+chamakam+sanskrit+pdf PDF link annotation
    • https://betenagro.com/sites/default/files/file/38125212766.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/27djtr5n5v460rc18te2arghmi/wegugelolagawa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fef5e3d1a---44911960202.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/govedokusanariropino.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/nkg95etvrsifgrq3up17v4u571/3260799115.pdfIn PDF document text
    • http://topflexsports.com/uploads/35681125315.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/49874960895.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/bizebumuvedexikonabuwi.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/d06a6cfe4038c3ad6359d7ada45cefe9/9275594224.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdca255926---lifotinebujut.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210827_011238.pdfIn PDF document text
    • http://blueyee.com/upload/file/172013266016.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/kujuxisitizulil.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9042cc7eb84529545fd3637c3eabc59d/moxekobiwunimos.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/88203791835.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/kefaxo.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/xipiwunalulinosopekin.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076309dbe779---22073130229.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/ot5hfim2flu47d6d2q04ggg1qh/lolivorizetalazubuxiz.pdfIn PDF document text
    • http://flexa.cz/docs/file/35085507905.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5bc81c13f016e7d75d103866e4cd2184/15671342890.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160887394e80b2---bifebaluwimumarej.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_off0000c427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC427 19172 bytes
SHA-256: 162ffdbcbbacda85cd6aa3fdcbe7fe48c00a876939d738c3e1440f4aa8ef19ff
font_01_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 10824 bytes
SHA-256: bb4cb4711a63517e05af8a208163cedbe40a4a6273e289d793e53202094b15a1
font_02_sfnt_off00010ddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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