Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8594b5dbd6cb5e5…

MALICIOUS

PDF

76.0 KB Created: 2021-09-25 05:07:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f8d063770506ec4a0481c74fd9d44f9 SHA-1: 8f82825653a30ef81ad6467d1ebe031ad1e9a58a SHA-256: f8594b5dbd6cb5e5d3d917fa024fa66059e15eee36388dd8dba84802f2c512df
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of a QR code lure further suggests a phishing or social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://oniceh.ru/uplcv?utm_term=shashi+deshpande+that+long+silence+pdf PDF link annotation
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/cdck851bvpvrrsod82g5anrvkp/24650005391.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/tujanixodaposa.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/2963633629.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/2084425843613c36d38567a.pdfIn PDF document text
    • http://chongqinghaohong.com/upload/files/wevafezodomi.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/68930549369.pdfIn PDF document text
    • http://skontrolsengineering.com/file_media/file_image/file/19746473115.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/807381da732962e5e6e1e5a78186f7a8/26304741223.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/31690734855.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/84195826182.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/50972614785.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/topulejolevufito.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5fab89646---34440383284.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/92797806046.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210911125545.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/27950601510.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde32981d4---xuvebagudasomozizugijime.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/573999698444016062e501f7f5a5d7cb/rebotowugegav.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/e7f065bce95b85d139552cf095c18df5/kupatojovexefi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/d04s7un57h9rfvtkdd3fr4d5p5/55067600106.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210908_221614.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_off0000bf54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF54 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76B 10872 bytes
SHA-256: 8ec35a433c70b81e37142f33f8f378e53bcbb1cff5ca3943b4f4260a6c6ccf7d
font_02_sfnt_off0000f03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 19380 bytes
SHA-256: 5feea5a1f94f0c68a087a963db9845e1f51b5fd250600c0a4f54f3bbeb5fb3af

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