Malicious PDF — malware analysis report

Static analysis result for SHA-256 45105f51a8091d55…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 21:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a19c70263bff1338f9615485710f4ee0 SHA-1: 83ddca0267710aa25f461b863933f25b7668dc92 SHA-256: 45105f51a8091d55a5a3ff20e01bfe6355aa0da68bed35b50e46983a88c2beb2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, as indicated by heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the link farm structure points to an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://jshtextile.com/UserFiles/file///gabik.pdf In PDF document text
    • http://teknis.it/userfiles/files/64555098478.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/86737512595.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/48114639100.pdfIn PDF document text
    • https://novitas.ro/files/zaduno.pdfIn PDF document text
    • http://metallpress.info/files/kuwanomafadet.pdfIn PDF document text
    • https://indicaperu.com/userfiles/file/89423689355.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/tijuvurexizo.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/72468480291.pdfIn PDF document text
    • https://luminex.pl/upload/file/zozinifesinogegi.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/050702a3367c5f603b6097f82b4a91ae/86849498477.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134192f64aa4---61948702159.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/58686554023.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109081703178826.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/litijapeviw.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/66347731105.pdfIn PDF document text
    • http://elsped.hu/files/file/31314476375.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c43f7fe66---dutisos.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/kekegok.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613328d13bf67---14358501682.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/5349424293.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/gipedewadudelipulox.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/161389e35d0376---zawatikobubozojarojowiwir.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/161388c8e3202f---tumipuvigatis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=vitamins+minerals+chart+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_off0000cc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC56 10732 bytes
SHA-256: be12426879aafb2cd9fdcbf7bf5c342a4990a46b5617d614f1aa7bc7373590b1
font_01_sfnt_off0000e4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 17268 bytes
SHA-256: 02bf8a94e2faea93159e440ca4399a82ca5d320c21849777ab38a21b051cbfa5
font_02_sfnt_off00011118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11118 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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