Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1aaeaeb544683d…

MALICIOUS

PDF

78.8 KB Created: 2021-09-03 09:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7637681a9147029e7f23fa4e1f4f3282 SHA-1: f96e56a2a92a7af523646cd92f3f725a11e5774d SHA-256: da1aaeaeb544683d172ac9559432533ddc7949d2a450adc9c264f3faa3796b2b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript, though not fully analyzed due to obfuscation, likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://metalltechnik-kutschi.at/79995855131.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/wotiwuveluvifu.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/5c0437826a2201fc0bc6d16ec3794412/libogorilosatijudegava.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/pexiroxa.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/ccf16ksp471flor56u3strg2m3/2964282698.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/64773874446.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/26109776845.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c8699d3018962950e21285c85f986bea/62483840127.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/55405581209.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/komokajujudimaxofazimutez.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/vivozewedulugodowa.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/76646742950.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6rvhoh6cfbo8hbut1v1upc5lop/kanosituw.pdfIn PDF document text
    • http://7onseventh.org/clients/868256/File/26020676024.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/32687805045.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cef4ce0080---27557245908.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/32581504733.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/15b01c4f000ca5f60f253207a32fca79/femurepunoronav.pdfIn PDF document text
    • https://advik.net/userfiles/file/keforup.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/12554500837.pdfIn PDF document text
    • http://loveforlungs.com/clients/a/a9/a9a80f3a93b7553e0860ec1960497db0/File/gutadobapeb.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/namexevo.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/61876796773.pdfIn PDF document text
    • https://alexspa.pl/userfiles/file/21410947082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=tactica+y+estrategia+en+el+examen+mir+descargar+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_off0000cbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF6 18552 bytes
SHA-256: 21b8bcdd0ce9bc6eea664995abac7778aebf9bcf0cf1e71110c50ec88a614a81
font_01_sfnt_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 11020 bytes
SHA-256: 04d97a5c3589661b734435513bbbeb559d0ba5998d3e6c31ab7a5b9c2ddc94e6