Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b252c0c75e78f4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-11 11:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5968285a0bdb68bee2fb7b9f302893b7 SHA-1: 67c18729ac9be26594b62a0bc04bc0a106898b25 SHA-256: d1b252c0c75e78f460007e08da856845648fba54b274b71fb72c627c0366827b
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://synerhu.ru/uplcv?utm_term=how+to+block+internet+sites+on+android PDF link annotation
    • https://fuoriscena.eu/file/xesizelebozogixe.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/18194551806.pdfIn PDF document text
    • http://confetti-seasons.ru/upload/files/97299807323.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/72016683152.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/barenokawal.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161347970c924d---wofej.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/60390864831.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/fabifi.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ec5d51b4525fac3f5118a5afebd2d278/lininubazodurokeminik.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161378ada9a1d2---17495072235.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/zisavavukakifukiru.pdfIn PDF document text
    • https://toocapen.com/files/lipamugakorijajipifogose.pdfIn PDF document text
    • http://rockefellersgold.hu/editor_up/gomaxiwa.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/selinamuxozoge.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/71260613179.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/jozevuravima.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/84460235255.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/rubaw.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/kuzud.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/bekapepib.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_off0000d262.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD262 17808 bytes
SHA-256: ac9c04fc89a3028dd08afa0efb7c45b8897d85141d8d051b62b1e388b273c174
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 10672 bytes
SHA-256: 18e7395d12b8f3aba942a079835efcd13b470e47df06093a866e874b282e41cb
font_02_sfnt_off00011886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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