Malicious PDF — malware analysis report

Static analysis result for SHA-256 b604497c815e8f31…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 05:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a11b06614e4451712b6049954401e8fa SHA-1: fe7e90b1ba1f6cfebaa94c0191fae34dff5e074f SHA-256: b604497c815e8f3178cbe5ce978c8eb107b1d0b9bc75e9d678ca6d035f804b7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests an attempt to lure users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://coretry.ru/uplcv?utm_term=luna+vpn+ios+14 PDF link annotation
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a5ece4ed0b640335f1081522c98e1c57/26015732700.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/lexibikenepe.pdfIn PDF document text
    • https://jotelek.hu/files/file/pazukevuwerobodosa.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/9b43320f04a7a19765b8a59c513b5269/48037322498.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/84929460152.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/vosikifetuvemalener.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e10356b9466f3778af7e22fc9962045d/49801667268.pdfIn PDF document text
    • http://hissekurban.com/resimler/files/kizidejulaxudoneb.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/lijepavoratez.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/88102117143.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091101351711.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/26157153271.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/98890673516.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/viwixilufegojow.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613723e9f2a80---91972746628.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/wikuzobofexuloda.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/26275135346.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/kazukiroz.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccad4d0a42---84885942893.pdfIn PDF document text
    • http://levant-tekstil.com/other_files/File/todufukevu.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/bojefoziwulevowojukix.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/80015557097.pdfIn PDF document text
    • http://baschin-heizung.de/meineBilderAlbertGrundschule/file/raton.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61F 22200 bytes
SHA-256: 09f78827d7f0941522bdfbb61da8dd72c8aaf4bffeed89ad6e8f1ad7cd553c80
font_01_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 16560 bytes
SHA-256: 322677b73dfbd045c97f7a81e2d4618f29cf805e82029ca5320f30a8b24e7703
font_03_sfnt_off00012d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D74 10120 bytes
SHA-256: 31d83c09767421156f0f620fc00a225411cb09d5bb7b99a011c10727e96b3e00

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