Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fa749e6f1a4b71…

MALICIOUS

PDF

70.1 KB Created: 2021-09-07 22:06:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 178d20bea2d7e84484ee15c6726d6b96 SHA-1: 2105c232f50bd8d51bbdcac4f2c9d77c505c2e76 SHA-256: a0fa749e6f1a4b712d2f24c8497363fe0bf5835e5be74ee34f1f28cd0915ecec
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the presence of compromised CMS links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857ec0bbc2b---5975592789.pdf In PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da06dfad56b---44008955632.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/zanuvebebanajujezaz.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ad7cb87d---baderuwibizuravijuw.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/46957437563.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/lusulalaxiwedulejemode.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/sr0vmep27fljj6ccb9eavq21q1/rajikusebulorukot.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021060500220381.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/xejevulivasafipurusav.pdfIn PDF document text
    • http://sooclose.eu/upload/File/77700565165.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/6efaaad6e2bcf5a4d3677dcf913276ba/1156476702.pdfIn PDF document text
    • http://chromatographvials.com/d/files/kizikuwumipufapifota.pdfIn PDF document text
    • http://globalbizkorea.com/userData/board/file/34447093047.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/8e141fe8a314db201c4c4370cd2408fe/jepudigekuget.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/mubujukogetuniw.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/47364645368.pdfIn PDF document text
    • http://caigeshi.com/uploadfile/file/2021070221100673499.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/jalijumakekuma.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16089d42a23403---95472785772.pdfIn PDF document text
    • http://htwy.com/upload/file/2036159779.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/27763963320.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/ed9ceec6808e31f1cfd6a3bf9b8920d1/832064607.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/df5b2f68cb5e8b12af6ef46f190e5297/94159074506.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/713bca491635ae1f0490f3d4c7559d33/kozenapigomiteludavekule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=pigments+in+algae+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_off0000b6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E7 14440 bytes
SHA-256: 11997c96c5642365d38eaace1ec821c326f5bed6fdc94c85f2d8a43603e0fcfa
font_01_sfnt_off0000da8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8D 10620 bytes
SHA-256: 5e4cd0fe469307bc605e4b94d43c646d5473ed0f3b4bb73cdcf03b3b75d9f63a
font_02_sfnt_off0000f29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF29C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.