Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cba84777597a21…

MALICIOUS

PDF

74.4 KB Created: 2021-09-20 18:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9fff509f55576d1670332549934790c8 SHA-1: 6a16764d691c37a6815e3ec6d0e3544db7dd1ddc SHA-256: b0cba84777597a216b2d3bf302252f4e0b6285be91d14e55872f936b8b6bf866
156 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 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 0.9953

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 http://theprofitnesstrainers.com/userfiles/file/gasoronamomopofi.pdf In PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210920_95E4B431ED383804.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/ti7l8vpijjg3ehaigo996h486f/45737403717.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/90773808397.pdfIn PDF document text
    • http://splogservice.ru/content/file/7673479741.pdfIn PDF document text
    • http://intertravel.hu/_user/file/zepidobodopa.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/biwezojalowexisewod.pdfIn PDF document text
    • https://aedwea.com/upload/foto/daximejuropor.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/labosegefisad.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/86983675860.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/64466406426.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/30098687606.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/tipuwewidiza.pdfIn PDF document text
    • https://angkagenap.com/contents/files/nudeselabixoripedo.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/81147162012.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130354b1e4db---jewodevifero.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/lawejogino.pdfIn PDF document text
    • http://desushibar.com/userfiles/file/30032195938.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/fidur.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/xuselejaregupiresadalun.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/53338081180.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141aaee99b0e---gazijinewonunuvorev.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/58938838387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=space+life+mod+apkPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC1 17204 bytes
SHA-256: e4b747e8972ecca5e1b9eb7a2e0549a65e6de299f10d942979a8a0c89d1cf7cd
font_01_sfnt_off0000ecae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 10480 bytes
SHA-256: 1c04fcf34c90029398c92edc563d6c495ed6d42b3af6f0477e778b809cdf5adf