Malicious PDF — malware analysis report

Static analysis result for SHA-256 63352d3ae68199f8…

MALICIOUS

PDF

73.0 KB Created: 2021-09-04 07:15:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2da0dd57a67df4cc39c4adeff544781 SHA-1: 01354deb15fdd16fb21e316a2525dbb02072993f SHA-256: 63352d3ae68199f882d80d70c32dbf35753e37a4f3e3bf4b1d031b28e2bc8200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it's part of a phishing or malware distribution campaign. The embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content, likely disguised as legitimate documents.

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://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fa7a6f8b878db6ce36d2c7dadea75d85/45761196968.pdf In PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/d7babebece1c03ba80add651ec46fb11/patiloxemotil.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbed262821---burisepisuga.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/ff1441636ba399af274c436779acfe50/74655666928.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160762e81cae12---nilevefuwuwalewegavasav.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/tmj17ejg7opmueb2kaj4mlvpi7/xiwutaxezis.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202108141004434429.pdfIn PDF document text
    • http://www.ez4parcel.net/upfile/files/2021/08/05/74222917945.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/53739525770.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/rob8dovdg5am8380npdhoh2tg3/95984032475.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608dde354d1d0---kuzajonoxutiwenunaxosato.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/sodesujidajinikit.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/44713183454.pdfIn PDF document text
    • https://jcpcdesign.com/upload/ckfinder_temp/files/20210706082845.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e575d071aa---nefitawujibi.pdfIn PDF document text
    • http://murasakijr.com/uploads/files/58245241554.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/jolixegojexibufekujowu.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e55ea5e5c3---kapamisavuzi.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/9011ed5632e6a1d5fad424fa0e5e2d73/73648887978.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/raxigamurip.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/c76123ed14aa949334e65327043a7db0/rubenokabipiwurewu.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/kotaladuvurotebif.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106151600492146.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/6329217311.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=research+handbook+on+employee+turnover+pdfPDF 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_off0000ba14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA14 11352 bytes
SHA-256: d97a4427b8e7b99d2ff7eba2e1f6a5b8c9c128b33399c891ced92696e9c32341
font_01_sfnt_off0000d478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD478 16652 bytes
SHA-256: e9ff30495e71b97fddc57b67974115bfaec5fc6828191ac8b82e91b6194e06ab
font_02_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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