Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bc0b613f52bf7f5…

MALICIOUS

PDF

96.0 KB Created: 2021-07-08 05:35:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4b73185c9b8fbcceb34edfed2d04c1ac SHA-1: 683b5808cb85f5097e150f8662699d15b207e4a2 SHA-256: 1bc0b613f52bf7f5d652e0100215149e4b68e34c83acd66d8008aee2c1be7ede
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://clickkedai.com/userfiles/file/nuxipagozudox.pdf In PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/dfef57fd2132f55b630c7d27bf599e63/10706555952.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/74949000231.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160877051e8ea2---jubenunatidigaxor.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/19115437850.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/68372254040.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2a5a5560ac4de9a9e20954c3fdc6b311/tapowuneju.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/3712608529.pdfIn PDF document text
    • http://guyfamilyreunion.com/clients/41950/File/bovazojeporizisoxopade.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d96ea8c6cd---sefagi.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210514105339_1277770413.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/2311491051.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210524013411.pdfIn PDF document text
    • http://chinahongji.com/d/files/39934147970.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/f36647f2ab0bc627ac8995f771fb0d9a/56632171348.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/gifefalasugoli.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/7jicg1ffs034b7e4bm4qprlu00/69320901183.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/314b543297f41cf6df4817b9e5114c6a/rogedakaz.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/fozijodudokemotafibekit.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ak01tdrrh8rl7o757stj947vdp/lawelikirinare.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/lapatikiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=roots+and+vertex+calculatorPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE373 10584 bytes
SHA-256: 8eb88df44476bd4a62cc9de17d7beef4bfb8d2dedde4c5e8cb46c3eb22465947
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 22368 bytes
SHA-256: 347caebdf6c583c62594da5c0a5037b4768ef3e1e0a0f23e5f2aa862e299382b
font_02_sfnt_off0001334b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1334B 17536 bytes
SHA-256: 258b012e01cd586b099031d1464568482784df3612ed817d2f0a8b7a08603ef1
font_03_sfnt_off00014dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off000165eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165EB 2948 bytes
SHA-256: b6f53551162136cdd6296e43e70436263f3bfbc65d53e145de305f39cc6d0603

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