Malicious PDF — malware analysis report

Static analysis result for SHA-256 408caadc1d8c0c8b…

MALICIOUS

PDF

87.6 KB Created: 2021-07-04 01:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 640c48762ed5c313fffad53bc2bf946f SHA-1: bd366151d1469e1b41b303e6c5b27d7e2fbb6a7c SHA-256: 408caadc1d8c0c8bdd253f9813ef0250fbefb6759d9d9f8440150f29e23630c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites and other domains. The primary purpose appears to be directing users to external resources, which is a common tactic for phishing or malware distribution. No scripts were extracted, but the structure suggests it's designed to lure users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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=marriage+photographer+near+me PDF link annotation
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709d5b50183---4291382241.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/zewugapub.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/974b08fcfe6c6dba312379d1b3122832/34635144637.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810557aea9e---dajetotupedasevimenowid.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bd25f94ada3---solav.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210622080331.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/77997611184.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/24908065a50e46c668d4ac503af06de1/99213943107.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087f37c079a8---19235585244.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3d647a4afdbada12e97a51b99720ec5f/nizovexofiwowabu.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/44232036398.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/adb92b730a7ccd6241882773bbc1cc92/34942335748.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2027a758e34461353a1061f9ac6d009a/vavasesudewosulazurisiru.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8881047721.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/lolunepitaluxilozifuzafu.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/83509630447.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4beef10345e39022298402f152f28f29/bisugirubamurikibiwexo.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/46bd8eb07228e30a648b0c7a749884fb/fibolumidaru.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085947b7eef2---tejuvugadis.pdfIn PDF document text
    • https://gites-les-bardots.com/userfiles/file/26481797209.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/45586191772.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/11908587445.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/bokalenurisumotomalusiw.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d232e62e71---fovavetozerosupeduwovo.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_off0000f4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BC 10480 bytes
SHA-256: 7089daaa8c14547a892094842596be30fcf18b2da66658d6af2f6e7e17f61a16
font_01_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 17108 bytes
SHA-256: 21f13a486a95ba019223b816a04b626b1c0da01e13948552336121fb07fea3ba
font_02_sfnt_off00013909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13909 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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