Malicious PDF — malware analysis report

Static analysis result for SHA-256 10fc900ff0a48d2d…

MALICIOUS

PDF

70.6 KB Created: 2021-09-02 09:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96b99aa20c943956d0829d66cc9bc43a SHA-1: 526900c707718090ddeaf35e85284690130e67cc SHA-256: 10fc900ff0a48d2d075e226ad45fb4b3cf5a12032479cbe1ae1a46d86aeff725
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://coretry.ru/uplcv?utm_term=android+11+manual+download PDF link annotation
    • http://ghioroiu.ro/sites/default/files/file/57185946088.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/kusifuvefavivukotodaxusu.pdfIn PDF document text
    • http://szwygs.com/upload/bexonemafe.pdfIn PDF document text
    • http://halaljones.com/uploads/files/37205424722.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/c54bb09e587700e47470c3d2f8197d4a/77073926284.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609967101b7da---94884707080.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/d8f7f484a0b64a8b8677128a55a7e6df/91737384646.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/20044623224.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/95930658107.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/8d3504ce901015147714ec3056ff38b1/givajiludixejozedozibu.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/44902acc323bafca95b5b8c49434b4fa/22967697840.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/2f4b9e40788613ac867f23ccf90576e7/kolago.pdfIn PDF document text
    • http://vipnovini.bg/root/f/uploads/files/tekarapoxin.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f297db60bd---jipemutenerijadakunidi.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/32026617293.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/zufegijixotulawilapazuwu.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/dewijolazutekapelobosa.pdfIn PDF document text
    • https://amoslodge10.org/ckfinder/userfiles/files/45947053049.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/58166786320.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/33rtdicjn0rh9m18at7qjbr04p/jaminidijunamovuzuniz.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f6797dec5---58635533592.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/pepokigaxukej.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_off0000b998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB998 10232 bytes
SHA-256: 02ca3c48d369571fc1258937f5751413f1e3a8fca85ead2b624e7ee4c5808a7d
font_01_sfnt_off0000d086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 14092 bytes
SHA-256: b26fd2937d8004232d63ac7c65c3953950e4d4ae2aaa495cb668784c149e0e08
font_02_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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