Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4e321a7184bce9…

MALICIOUS

PDF

78.1 KB Created: 2021-09-15 22:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f06c5151a4f23068c4f7f133491c76e SHA-1: 19329fd4b020ceb70f2a8e23265b3b1da5c441f6 SHA-256: 8e4e321a7184bce927ed82a0f43e53e063bb12a81ae904c94c75c1f6caf6ad5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially leveraging embedded JavaScript for redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=vipul+mehta+singer PDF link annotation
    • http://orgue-chantepie.info/FCKeditor/upload/file/mufosidibomo.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/19775172713.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/jobenunevebopeji.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d3b1e325ec---79325191227.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210916005329117.pdfIn PDF document text
    • https://vitanov.rs/files/11744933655.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/sujad.pdfIn PDF document text
    • https://basisnomor.com/contents/files/58824999072.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136cac0d5329---55515655696.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/zunerunisapiga.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/pufexemuxojikatagirirel.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/68693464948.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/93531662247.pdfIn PDF document text
    • http://njxinbell.com/upload/files/87648460718.pdfIn PDF document text
    • https://sentinels.ro/userfiles/file/43891821869.pdfIn PDF document text
    • http://capriololaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81328440322.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c1b0f9c87c403089f1a5d1c4895741c/jozulov.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/59992719615.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/85147259712.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613681c7e46aa---51194038694.pdfIn PDF document text
    • http://chamdure.com/DATA/files/30903498582.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_off0000cbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF9 10648 bytes
SHA-256: 653464a1fdca052fd9b5d1bb8bb313274c05314db8634b769208e23ac7668a80
font_01_sfnt_off0000e42a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42A 18140 bytes
SHA-256: c3bc9ee616266793d3ed7c55b6000a46c78716d08e51b5d9c2f8005d9a6796ca
font_02_sfnt_off00011325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1