Malicious PDF — malware analysis report

Static analysis result for SHA-256 b61e4c990e42782e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-14 22:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7ab38ee3c014e139dd9b1bcc61f0e08 SHA-1: 624c709439ad6dcfcc550d8df1c05540d53dba9f SHA-256: b61e4c990e42782e5ec9433785c9a6f0da91099d1d00a44691fd6e3d8363f4e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ClamAV detection and heuristic firings indicate this PDF is designed to lead users to malicious content, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3891

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://ketchas.ru/uplcv?utm_term=how+to+easily+share+photos+between+iphone+and+android PDF link annotation
    • http://jinyezi.cn/upload/51584437961.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/jamezawuzoxusedabodokeg.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/regexu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1a29ba19---15147420180.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/8849677268.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/wonisolavunaf.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a5a67f0fd3fe8ca788681d1bf78f4956/dozutozejuj.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/30327348170.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/106f50f3898c3abc0be51367ab1a158a/99929557485.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/tosajosexevafovesoxiwufa.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/c1df8c4feaa2d0d5045270f204ab2da2/95199710678.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/luvazaromemet.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/tujotezuwage.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/32967628966.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1cf2a18f5---30580306320.pdfIn PDF document text
    • http://ghibms.com/userfiles/files/12259080096.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210906150334.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/tejarixudiwerabumixenavu.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/4130eea1a7b6e07a7470312fa740d406/xawoxazujelur.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/wekilejipuken.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/zadivupebonerusak.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/rakef.pdfIn PDF document text
    • https://adci.vn/data/upload/file/fevug.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/43825337249.pdfIn 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_off0000c242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC242 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA54 17224 bytes
SHA-256: f432a6cc4d2b6b50a873985eafe1b986b781e37978825f48b3459bba47ec49bc
font_02_sfnt_off00010658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10658 10820 bytes
SHA-256: 5ba3afdcde7ef5e984760344dccb74447068b3558474418781972d0daed72d32