Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f1b11a0dc69eb75…

MALICIOUS

PDF

80.6 KB Created: 2021-09-13 08:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7af25591339c5e7250247bcdd27cba45 SHA-1: b3152178033adb96c5a6dd351a2faf56607c50de SHA-256: 9f1b11a0dc69eb7589aee105771f5f24ec9d9ff0d73c38ed4c850f9a96fa4b8e
176 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains a link farm pointing to multiple domains, including compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were extracted, the structure and embedded URLs indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/8f4ceb52bb8401544b4d62dcfaeb78b7/95186157776.pdf In PDF document text
    • http://marsalanoleggio.it/userfiles/files/49308233292.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/86638351735.pdfIn PDF document text
    • https://krajkarka.cz/userfiles/file/23066819497.pdfIn PDF document text
    • https://actorconseil.com/files/file/27708617889.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/61b4deda7049ff7955f463bd34d0a63b/dusiwimakusasirig.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2e6465bf---64669235644.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/xulelekivaletev.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/mujol.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/wuxen.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/72490739432.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/18601ce4a3e1581f9f1fb0dee24fcf39/wuvonoven.pdfIn PDF document text
    • https://foodthings.us/userfiles/file/76817246697.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/1083437309613a215b7f5f7.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/64936083563.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/50827888621.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/3910594201.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/21755170584.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/d4g4leulgmnbd4dfamcl13uj2k/88010900722.pdfIn PDF document text
    • https://ingatlanfelugyelet.hu/uploads/file/fibifesuzufimuzopat.pdfIn PDF document text
    • https://rpaxis.net/userfiles/file/suvazutirul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+view+my+wifi+password+on+my+phonePDF 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_off0000d4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10876 bytes
SHA-256: 62ee2a447364995b1ef7a12c0d26f93133a227a58ececbd10765c1c64fe600c4
font_02_sfnt_off000105bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105BC 18272 bytes
SHA-256: aac232d580476554f44537e1454f33367415678eea365520b39a6388eda518c2

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