Malicious PDF — malware analysis report

Static analysis result for SHA-256 bafef6a0c06d5d94…

MALICIOUS

PDF

69.6 KB Created: 2021-09-28 14:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c9a973051d671b9f1d4c03028b64f593 SHA-1: 6bb2bb6fb954cc9ebc00a4ddbad869b23417e9c5 SHA-256: bafef6a0c06d5d945aee3bb6d09a70b8acf137157d2d83c7503efc7cc36f5d50
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, indicating it's not intended for direct user reading but rather as a container for these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=crash+drive+apk PDF link annotation
    • https://psihodesk.ro/ckfinder/userfiles/files/xopasixotabakojutulenaw.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/1217838783.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/64197184258.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614335be79965---kezagu.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/40755361528.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/65053198803.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/puxeniminosaminew.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/22311657775.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/3325960387.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4115a1f11365cf4c4580a2393f9e1f73/20664849850.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/towusos.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/37922391865.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/65304489384.pdfIn PDF document text
    • http://giadinhmedia.com/uploads/files/zatevufozaxukovilazezov.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/fesejew.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/4da7baa30a17d8785b6dd26ad43eb366/57304683380.pdfIn PDF document text
    • http://alituncer.net/userfiles/file/92071112804.pdfIn PDF document text
    • https://umutfm.com/resimler/files/25414912594.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/ef57e370535bfbba73edf20895afa4bf/wemanomirofir.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/nopazexejubiriputit.pdfIn PDF document text
    • https://clinicscrm.com/img/files/fifinulaxorerelulazajena.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/15188230387.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/85414271033.pdfIn PDF document text
    • https://panama4d.com/contents/files/1757100669.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_off0000b038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c84a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84A 16360 bytes
SHA-256: de29e3c4381847d139a2cef69daadbaeb03b32b49a062c6db03bdac574908c4e
font_02_sfnt_off0000f1dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 10308 bytes
SHA-256: f3895f40009c65a7a2d358a1f6f1b9cd1f2089edb4c6fdc88b39ee1e6a252911