Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a391164dc621497…

MALICIOUS

PDF

79.1 KB Created: 2021-09-18 04:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd12efdeb2eeda2d532e2acaf668e9d8 SHA-1: 432088cc97c03ee4abe4820dd2f00e11f1532dbf SHA-256: 4a391164dc62149744ca0e34ac4c74ee0f424310f4266c2e15bbc03c65cad89b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9270

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
  • 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://irlanc.ru/uplcv?utm_term=deadly+seven+sins+game PDF link annotation
    • https://tckontrola.hr/files/givodanulif.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/3182083525.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/24829228433.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/zexabumanitorotapijes.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/892328719.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/41635242609.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/38514028889.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161409416ba51b---fividam.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/mta1go1ur3vc250u9u6n3lsvg1/mirikavonegozex.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/6965736836.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/tatawenimunasi.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16132193571d5d---27545474811.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/jusanibakunoti.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/vazabigisagamezululewefu.pdfIn PDF document text
    • http://uptownchantilly.com/uploads/files/misudisikopo.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/27225430030.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/91764501380.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/nesevumezejex.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/73454477636.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/60867011384.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_off0000d61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61F 10456 bytes
SHA-256: 28063355abad9cef60189ada0698a7a3e26ff77d1e500657586216a5edfb78ce
font_01_sfnt_off0000ed96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED96 20432 bytes
SHA-256: e97da3730a4b0bb8833a6a80072d7fc6076a9972f919a26aea86594357e669f9
font_02_sfnt_off000122b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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