Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd0941d4cbbf0b9…

MALICIOUS

PDF

91.1 KB Created: 2021-08-21 17:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a5a2a658a925d23c9f79f4332ddb556f SHA-1: 81ea8238c4fa8889d43edaf9573f1a1f597b8640 SHA-256: acd0941d4cbbf0b91849bef731a755d3f05ce0786727ece158008d54b9459e93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to disposable hosting or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript, though not fully analyzed, is a common vector for exploiting PDF vulnerabilities or initiating further malicious actions.

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://web68s.com/upload/files/54362217508.pdf In PDF document text
    • http://abnicum.ru/files/file/23998354009.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/nijobiga.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/824683323.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825c703c8d0---89927910323.pdfIn PDF document text
    • http://thedreams.cz/files/4579667814.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/9fgdickifmvlkbs82p6jq0hqjg/tizised.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b93ff59d902---44041639127.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/36863448648.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/fuwekalagoseravi.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f939930fe9---dedexiwotak.pdfIn PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/dibasorodavew.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c8e181218---18340312753.pdfIn PDF document text
    • https://drsubhashawale.com/ckfinder/userfiles/files/baxanujagesiwamo.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/mipifi.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e14c7112afd---guxuvepak.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/fa7a6775056de37be95621c673d649cb/15846865873.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/6f0ffeeb0e96fd97f38c971f57439de0/66895669910.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/lowuwogulep.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b61c92b44017904e2cf9ec3ef9b9480e/baxifesufuzuxutikeliwi.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/kefoto.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/78410439019.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-25/20210525080221668053.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/686cb47b1739d320d953d06e86668d57/50138113107.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=set+associative+cache+calculatorPDF 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_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 17708 bytes
SHA-256: 85c93e2a21a86526a40c0d69e91aebe9fc3ed1d4ba1e1cf9a6b37de06707b926
font_01_sfnt_off00012c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C70 10464 bytes
SHA-256: 7da3e30a04400eb6090ca1266f9aa4d172633aaf531a34594da217841ab927e9
font_02_sfnt_off00014458.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14458 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1