Malicious PDF — malware analysis report

Static analysis result for SHA-256 865bce1c3a0250e2…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 03:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 874900b386611e64ac69ea356a02918c SHA-1: c2a25a8996e9fbc0cbc0651aa94786964f2c9f99 SHA-256: 865bce1c3a0250e22a1667e61641cc40353278e7313bec52e6e413299e19de7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a link farm with numerous URLs hosted on disposable domains and compromised CMS uploads, suggesting an attempt to direct users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://pixomot.ru/uplcv?utm_term=hotspot+apps+for+android PDF link annotation
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161401aade370b---92813468307.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/69931886300.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/15866869866.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/mumaf.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/mivuxezivirisid.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/15739924807.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419e8934944---pebosulikagakawusik.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/wizefuzibudeloxibobozika.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/jeduxurisup.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/71105631132.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/2021941410211014.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d109ad9f22cb9e6c5ca5267f9f313eea/14417968820.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/relubomubavowubariv.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/65553913858.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/pexazoxawawukitawuketelop.pdfIn PDF document text
    • https://proia.bg/userfiles/file/dedefapo.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/pexekubejunemotajurepapom.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_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000febd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEBD 10304 bytes
SHA-256: 5c667240e2ca7b92be78e58b04115439597c41e0bc8c517343be9bc9e05b4772
font_02_sfnt_off00011605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11605 17180 bytes
SHA-256: 262547683fd04d337db26743e7f5a9791d130206c92a1b9d802a3a4a4307c717

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