Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5c3d6f5c9d41229…

MALICIOUS

PDF

69.4 KB Created: 2021-09-24 17:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f274fd396afa3904b8378292fc2291b5 SHA-1: df5dc07b9fc4da3583f88303c7ad259ea6c510ab SHA-256: f5c3d6f5c9d41229b832632e5ce65813fcd9340b3a64277a64e39dc52b36e19d
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs. These URIs point to various domains, including an IP literal, and are often hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users. The embedded JavaScript likely facilitates the redirection or further malicious actions. The ClamAV detection and ML classifier strongly indicate malicious intent, consistent with phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://laborke.ru/uplcv?utm_term=bmi+calculator+android+app+source+code PDF link annotation
    • http://angerdress.store/ckfinder/userfiles/files/xotapipulepawadodemetibo.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/3271760202.pdfIn PDF document text
    • https://rusepress.com/uploads/wysiwyg/files/duvigosikizudunu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140452e979d5---23964600220.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/tarisekapixiruj.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/98312137693.pdfIn PDF document text
    • http://ciskmv.com/css/file/lipinufejonerizafazopowuf.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/wikugevob.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1614d040d20fc6---zozizatosekirifobivizo.pdfPDF link annotation
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/94511271726.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7f786d1ea7a755b0ab7e09bc6dc9dace/tijuwariditemoduxu.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/93944909572.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30e04e4b68809b43849abc7b76c94f9b/tiworinowijuxu.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/37545356452.pdfIn PDF document text
    • https://shinaltd.ru/images/file/6121145996.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/87636414119.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/nadukuwotelazi.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/rozuvun.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/73648370457.pdfIn PDF document text
    • http://cycling-software.com/files/file/95734024569.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/54454226606.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_off0000af16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF16 10828 bytes
SHA-256: ef9b375c21a136e081cccf548133375940da2611d37fd8822a99ffd3168ca7b6
font_01_sfnt_off0000c815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC815 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 15104 bytes
SHA-256: 5e54dcd995198ac20f787e0cf581961649323c6eaa4875bc0ae494fd27b3e154

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