Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bc149d24d843177…

MALICIOUS

PDF

77.5 KB Created: 2021-08-21 10:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 53cfa3f3aa8cf622313ae4d9693caed5 SHA-1: e3aa65e20b795638f556f06a643804a941a83fd9 SHA-256: 6bc149d24d843177eab0ea2cb1fd874173dd59347dc9f4dcb733987edc7cbf21
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of malware. The document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://laborke.ru/uplcv?utm_term=ionic+and+covalent+bonds+worksheet+answer+key PDF link annotation
    • http://slsnn.ru/content/file/92666816718.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dea540bd5f8---xovenigajujavakugija.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/b6g9si6eng5alahgbhbdr1adtn/68675335126.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/69351674101.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210722141017.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/43860441111.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/taminik.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e832e0fa34---64981890281.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/c0qjibbqrbj47rqd3moflcpteo/tatad.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/8237d02082b4f6c6da7d77d2ce4e80ec/gutizam.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/96b7c650b3bfd14b0ab9c0bffa827805/65649979798.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/161061e8b0991e---romoweka.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/68593127435.pdfIn PDF document text
    • http://tauben-buchmeier.de/kleinberliner-schuetzen/userfiles/files/89489970156.pdfIn PDF document text
    • http://funperm.ru/content/file/peninumumefitalab.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/95624088599.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210716003031206.pdfIn PDF document text
    • https://mimpishio2bet.com/contents//files/12162663953.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/64947749341.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/86eff448ee8e959aabac6798b7036014/86923419574.pdfIn PDF document text
    • https://songhong.info/userfiles/file/fulibunaganuripozadatel.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/80394944422.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210723_EB09E2C7E81787A8.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/42057886040.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e37dd6cc8---rivufanogiwufuxum.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_off0000cd72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD72 10916 bytes
SHA-256: b5fa5c64457723f11499a119670217c6a23029c4c62de855924ca82e22a5a385
font_01_sfnt_off0000e6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BF 16080 bytes
SHA-256: 17d16fd8c1c3da31e57451b3d8128c37d4a6d8c21b9805541e7f9a6242f9c851
font_02_sfnt_off0001104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1