Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2d9c65cb9f835e…

MALICIOUS

PDF

93.5 KB Created: 2021-08-14 05:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7676c1729ba908f2e489f24318563fe9 SHA-1: 5cf28a9a5bed9f4c012b7a6dc7c9d53454bea5dc SHA-256: 0a2d9c65cb9f835e7717366404a3170fb1358ecf83ad691bb2e13ea68f626636
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://ylplj.com/ckfinder/userfiles/files/37998300811.pdf In PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e0faba6b53d---2281932187.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/degunomuxaredib.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/51052441626.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/fitotog.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/72b572a44af5c5ef3e68d2db9b2dd25a/jusiposavupamidusijofumex.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/jgg0af0sv1sfam7b8ioaqqb9us/39344643048.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/8e4833d84a6bb39726b4f93ee5a5aab4/newamemujobob.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b2deebeaa---71889544222.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/25220419021.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003a5f8af0a---77506542658.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/wefugatibupiroduvu.pdfIn PDF document text
    • http://businessvaluationapp.com//fck_files/file/95670346892.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/dufurumirolid.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/getawujamuso.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16074516cba041---vefasogumuwifol.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f86a4dea6---50427998647.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16084a1d2f0d9c---zumedepi.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d3454f7ebe5466375c7ea80e78d78e6/laginorenodod.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81144d3e83---77110180468.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/27149411870.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/fatikuzakokiz.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/lepufewulil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=audio+technica+lp60+bluetooth+whitePDF 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_off00010824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10824 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012036.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12036 17632 bytes
SHA-256: 0ee173c60562b0a466ceb7b8192fe4aa91e9e2d4b2a6cb886e7aee4ce425137b
font_02_sfnt_off00014e0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0B 10940 bytes
SHA-256: e4bbc1047d628ccb7fbdf74c659e512c6110f44ec88647598fe772e32e787d68

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