Malicious PDF — malware analysis report

Static analysis result for SHA-256 820d5ecbf9e13d81…

MALICIOUS

PDF

82.9 KB Created: 2021-08-30 10:28:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e058886c8cf432d3d2db56a1f6a74f2a SHA-1: f842f2f9e434f4386d7137d879fed5c278e5d7d3 SHA-256: 820d5ecbf9e13d81742c01c462ac57c40bf9d6e1d9a8493d633e2b6ff24a153b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it's part of a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://queure.ru/uplcv?utm_term=how+to+request+email+receipt+in+outlook PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b677cacfee---bujosap.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/lafodawigutizidazabef.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/11845371207.pdfIn PDF document text
    • https://codecs.roimages/file/3341460965.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f73186211bd45807bb7ce511908c3de8/vudaz.pdfIn PDF document text
    • http://lagunaapartman.hu/images/user/file/65821420951.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/xujutafekibagewo.pdfIn PDF document text
    • https://clic-essc.ch/ck/ckfinder/userfiles/files/kuvowasapekifexobuvivuge.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/9edc2a678df05e61736f97b80c3b13fb/94442285993.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610485f555d34---43059059250.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf8295a57e---49996456607.pdfIn PDF document text
    • https://izr.fr/files/57759053958.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16084d32351037---fomisifurefotamipowuwo.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/855ff934067133d88f564de1e515ec10/davosavifoserugipokipibu.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/57140190874.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f74a1bd212---xesosewosel.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae8e567478---33694562295.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944b76b069f---dilonupugizipi.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/gelubosoxi.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/67255187133.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_off0000ddad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 18016 bytes
SHA-256: c64089320bbd9f75d7d436df3431544c7caf886879599200d8c168bdd1388f5b
font_02_sfnt_off000123e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123E5 10948 bytes
SHA-256: 41f72d566a4f27849aca507db9d846acbf3e112491e7ebd7b0585131086692ef

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