Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9b033dc13c95de1…

MALICIOUS

PDF

89.7 KB Created: 2021-08-05 08:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 89bf3d6a2125089fa9318a478fea6c2a SHA-1: 320053eea30b193e344f508db1b12b3c9f066628 SHA-256: b9b033dc13c95de135578215ba77af7e688daa65024ba861a308af3113df391c
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 http://aromamahabaleshwar.com/ckfinder/userfiles/files/gagavunusunupedawe.pdf In PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/kn438jtmhechuuf8db9580r2p0/72622716442.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/biwim.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/mekexodojorez.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8f3b2b22e---18845167280.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ace0ea83c3---dujifasafexikakegejixob.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1946624dcd---divida.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/mawagafepukizapodisoluju.pdfIn PDF document text
    • http://effektfilm.de/files/file/sanurojedozetexoxi.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/12711548958.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/wojeput.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/96549e48d7304c8dfde5a6da503b1967/fakipegobanoroxoj.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/12362047133.pdfIn PDF document text
    • http://954move.com/clients/4890/File/96787388808.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/sifaxit.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/40805212615.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/japod.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/5ea4d9ee83b3e0394b4d73896d813fde/1868177890.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/prb7mfip1uar1t32idernba159/94049603366.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/gasuz.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/67884566702.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947661ccfb2---tutikelusetojeve.pdfIn PDF document text
    • https://maclashoes.it/file/zudixojapen.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/finojowusirabu.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/lu85392p2pbp8usund7tconnp0/wozijuwagutepuvin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=resignation+letter+format+in+word+docPDF link annotation
    • 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_off0000fabe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D5 10952 bytes
SHA-256: 6bcbfda8e80790d58954b26314f7d736cca439962b66fb53d0c8c97d3809ae6a
font_02_sfnt_off00012c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C17 17108 bytes
SHA-256: b48466260ca664f2eaa858a2b1be5b4c0748647bf07d7e5d31edd8de38e5a843

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