Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e0893177b5c6e05…

MALICIOUS

PDF

77.6 KB Created: 2021-09-23 04:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9fe3e910f139d510598c74e8b1f123f4 SHA-1: a4c3f92122b855ec134248169579e37453cef5c5 SHA-256: 2e0893177b5c6e056355f543fc10fd3650ef9035aa832b149fd963548624bf84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external URLs, some hosted on compromised CMS uploads. The presence of embedded URLs and the overall structure suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://drafthe.ru/uplcv?utm_term=ps4+screen+mirror+android PDF link annotation
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/5727232639.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/wizumosovu.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/tosowanipezudenagixepamug.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/51272037424.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/funabosufolowenokitapizu.pdfIn PDF document text
    • http://shijijiaming.cn/filespath/files/20210913191040.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/50996005955.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210907044641.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/wemebetamebowivolexo.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/gagugewudoxef.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/93481258593.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/togozavetekusa.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130b03a52dc5---zotafamokefogez.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/20848995408.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/39573529188.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/1293cc1f75aa0940af570f755e80f694/fitupubola.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/68815282562.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/guzof.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/24177360159.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/06c019399c310cf4e2dfba5a19910852/kavuwuj.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/86a55c4113e4fb08a25d4cbbea9c2ec3/69426126350.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/runolumawu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a7bd90fa7e---23987744896.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_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CF 17728 bytes
SHA-256: bfaa6e711c0bc56e8d2b8db73d8a61ef4e22b7ff8f187aab6d3fb97af33787d3
font_02_sfnt_off00011163.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11163 10468 bytes
SHA-256: ddf3171b88b6640e9ffe4ddd5bf1c44364f42c11c7940e669533ea88d3041f7a