Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f077ca37138c6d…

MALICIOUS

PDF

86.8 KB Created: 2021-07-04 04:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9807c4e0676e34236d88045b476af096 SHA-1: 32216cadf8e5c4d08caab0e17d6c07fe9e14333e SHA-256: e4f077ca37138c6d59a82ef78bdd498b1fc017d9b0f422c6a0d5e6f4fb7aec6c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. This suggests the document is designed to lure users to potentially malicious websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://archism.ru/uplcv?utm_term=determine+the+number+of+terms+n+in+each+arithmetic+series+calculator PDF link annotation
    • https://acgroupenterprise.com/userfiles/file/19671695193.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/fipudi.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/11652644384.pdfIn PDF document text
    • http://alkanboya.com/files/file///medozikalewe.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b029894fa7---xijimemikokoretivanivuw.pdfIn PDF document text
    • http://0930actress.com/files/files/jazegijel.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/duwijonelubages.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16075632826b93---nilopapuwetopijop.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d430ce2d28---mopor.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0646dafc7---zaberewajususezokalo.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/zupovi.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/90182904668.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/27954575814.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/kcbc0au987b1mmk8dbt9jka135/xekuxatujasinoxo.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/susapamavowonozifalasedo.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/rubibef.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa20793514---83327734971.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d09c4ac0248---mawikelilujawenavonize.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/fujukimoni.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/wigepobuxezukavo.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/41914407462.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vpoqels6noivqutnvim70pbuhi/61325000711.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/1714622331.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/6376559829.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_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 10844 bytes
SHA-256: 2dea6a05e3fde2bd1c15e1db46ee3ce57e5f660853599516a965e60bf93929a1
font_01_sfnt_off00010507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D19 17484 bytes
SHA-256: 87bcea5d9fa70bdadb8e3254fd16f6a3730937cac7c15760c106af6debb428cb

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