Malicious PDF — malware analysis report

Static analysis result for SHA-256 61cf98fd39eeea24…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 13:48:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 1ea2256887f84e8d410c7ac11c795348 SHA-1: b1c7aaa849ec00699332e0878011bd06ca64032e SHA-256: 61cf98fd39eeea24ec4a408263c42c2f3802a0d183ec42ae44413ccd84a9c04b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external links, many pointing to disposable domains and compromised WordPress sites, suggesting a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://divinenine.net/userfiles/file/pavufibotuxexesiv.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/wojugeg.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/zoruponokemijowuru.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/bemamiji.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/93421346433.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17277194862.pdfIn PDF document text
    • https://iwistw.com/upload/files/67732373015.pdfIn PDF document text
    • http://metallpress.ru/files/xopadinize.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/72700294782.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311f76a1322---46813124645.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/deedo1ejuj7ipef2r7q1ke4bi3/ronevutizasa.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/91687445122.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/63211932668.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1984956176613aba4d3e623.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/taxijegemijigasidip.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/wovitasadapawipodimazajuw.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/merijizasu.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/xojivelatiwuderejegena.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/wikurutomosatubesevirana.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376db2571c8---54882380658.pdfIn PDF document text
    • http://graciaindoutama.com/kingkong/userfiles/files/26527974952.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/71311541135.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/pevoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=sabe+safar+apk+downloadPDF 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_off0000bb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB33 10696 bytes
SHA-256: 8f7533aa8ecd962324f065c9ef663b2b2b53a21811398462876710b1bfdf1f0c
font_01_sfnt_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 16640 bytes
SHA-256: e85c3066ba94e44764e33fc7ef9e60259fe4f917afd09772c0f1eb7036d464d8
font_02_sfnt_off0000fe68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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