Malicious PDF — malware analysis report

Static analysis result for SHA-256 a769d7dc12bbbc79…

MALICIOUS

PDF

92.7 KB Created: 2021-09-05 05:49:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 05cdc6a8c09b5982e7049105285918e5 SHA-1: 1195be4697bd30bc93c3af2d57d7476a01765fc7 SHA-256: a769d7dc12bbbc79207454cf048f184d0b86d8ed046f442f5b83c47c213ac7be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or redirection mechanism to phishing or malware distribution sites. The presence of PDF-specific heuristics like 'PDF_URI' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=chuy%E1%BB%83n+pdf+sang+jpg+mi%E1%BB%85n+ph%C3%AD PDF link annotation
    • http://cocoal.com/uploads/file/35930117116.pdfIn PDF document text
    • http://momsystem.ru/public/file/rimefamasix.pdfIn PDF document text
    • http://pettwayfamilyreunion.com/clients/39389/File/gobejidetivuzuj.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/d2a4e368cac4e1c2a38525c0e9340bb5/43394144444.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160b998c10ebea---lizewofumoxuwelo.pdfIn PDF document text
    • https://birudongker.com/contents/files/61846370615.pdfIn PDF document text
    • https://amblamy.ee/upload/file/badorivupupogoro.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/tufupewadefuzubuvoxil.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/f5b422a4924afa6d07ff7e13a83fd6e4/jozataxuze.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/rosarokemozivip.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/zamedikonudoduviwuvez.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/91241301657.pdfIn PDF document text
    • https://chris-arnold.com/userfiles/file/buzakonabavidomazuziguv.pdfIn PDF document text
    • http://kool-house.com/upload/editor/file/lejefugel.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/f9bvcr7k9u8dcob93dp59e3for/bujakuto.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/80571050727.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/79741067495.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/tekazoboraluvo.pdfIn PDF document text
    • http://veitali.com/upload/files/kemuzulijaxegim.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/10451087630.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610079ed7bf9f---sirafigonup.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/famufesukasirajaran.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E9 11392 bytes
SHA-256: 28625427c3797d8a5431dad043e00eda4cbefe934a24dbb64cf84ffdd22ee9e1
font_01_sfnt_off0000f00f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10821 26864 bytes
SHA-256: 601dd1841ddd7f7940e95541a844df941e54b91ef60b2f302b091b73b71fc144
font_03_sfnt_off00014b4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B4C 16576 bytes
SHA-256: 3b8c58f36c16230181c3b056c1dfbbdd88da17ac7c24d51261a791e157a6950b

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