Malicious PDF — malware analysis report

Static analysis result for SHA-256 350c279e9e93ea01…

MALICIOUS

PDF

78.0 KB Created: 2021-09-05 04:09:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f0e3358cfb8bec422c7040903d4e08c4 SHA-1: 15f3e61961bf1a8b03b7acfbf0a84fd1901ed23e SHA-256: 350c279e9e93ea01ae98b48d1fc0c2719a9ad80646b33c04e0549b984fac61c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body was unreadable, but the heuristic firings strongly indicate a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/llbph9unl9qrkovj7i1lq7fljk/wekarosevozixetewobus.pdf In PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf5d5d025f---leloririxorotenepes.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/21549362142.pdfIn PDF document text
    • http://chemicalengineers.ie/images/vakodaroz.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/94357591731.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d377223e598---52305847031.pdfIn PDF document text
    • https://aspirans.com/files/file/tabugugolavev.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/c17ba3962ab5b4284edf0f509cf5252b/53202897786.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/puruf.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/2365707338.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/wibixelesuvemex.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/33459878553.pdfIn PDF document text
    • https://norservis.info/files/files/97639012588.pdfIn PDF document text
    • http://svatba-emi.com/uploads/pages/files/10122630547.pdfIn PDF document text
    • http://avandcie-automation.com/ckfinder/userfiles/files/4434337083.pdfIn PDF document text
    • http://kmconlinecme.com/userfiles/file/fobokepapebixaliwavo.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/fuxiguziju.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608842483f6a5---42835952353.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/2929658791.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/muwazuzuremugakujukogav.pdfIn PDF document text
    • http://byecook.com/ckupload/files/vujabib.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16089d59104027---josafubatep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=haccp+food+safety+employee+manual+pdfPDF 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_off0000ce0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE0F 10792 bytes
SHA-256: 13d7c436b2cd73337e66db1c83abf9e6a3b159c6b5f227e539bbb0e5c1558927
font_01_sfnt_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0A 16756 bytes
SHA-256: 7a2e621ed3ec5781c65e0a573b3caa3c8299d120202dd1b3d6f5a7d7ad3da65d