Malicious PDF — malware analysis report

Static analysis result for SHA-256 e464144438402bc4…

MALICIOUS

PDF

78.4 KB Created: 2021-09-12 05:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b768c59e18f1dec3b3711aaa9136f84 SHA-1: 642f431af8ec16e64c5abf4007126b58147796b0 SHA-256: e464144438402bc44fe444e5b78d7ca5f16029559cefc06387d5929aa43c3755
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware delivery attempt. It contains embedded JavaScript and a link farm pointing to potentially compromised websites, suggesting it's designed to lure users into disabling security measures and downloading further payloads. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://nikunjfoundation.org/ckfinder/userfiles/files/65395893808.pdf In PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613614407719e---34558065659.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/duvirijedefaleradiwan.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/munizelo.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/38482835383.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/q2smjiqfelgdt3u2219o5o7prb/jijudide.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613888af1eba8---xijosajirokof.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/f2dac2c9fce0dd968f1835de72816f56/11632001705.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210912025519.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba6893fb8---vadegedekazekotamuw.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/8614567369.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/kowamenugar.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/peretakulosasa.pdfIn PDF document text
    • http://radecznica.pl/userfiles/file/94706900094.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/pugom.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/14646172172.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/50243272991.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=top+5+app+lock+for+androidPDF 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_off0000d0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE915 10404 bytes
SHA-256: 9614671fc18ac72f67c23a84af1b151733f44f415fb9189ec585a6b97415cc5f
font_02_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 17188 bytes
SHA-256: f3775b90a850d60cd63a9445f5a6db6baf52ca07df872a141fbb57f732f8c394