Malicious PDF — malware analysis report

Static analysis result for SHA-256 615ddaa94be1ac29…

MALICIOUS

PDF

99.2 KB Created: 2021-07-29 18:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e0ac222c9d6af96834d42a70a7c0e4fb SHA-1: 7c4d84a8bf3dead0631bef1f9a16eb5141c2c54d SHA-256: 615ddaa94be1ac299879b7e953d464628bf167b68a1b67a8b6e6d79a61f4df84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055 Process Injection

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a link farm that directs users to various domains, some of which are hosted on compromised WordPress sites or disposable hosting, indicating a phishing or redirection attempt. The presence of numerous embedded URLs suggests an effort to distribute malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://suvagcentr.ru/userfiles/files/weribaxazewunog.pdf In PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/rasamojaveximarepakaxomej.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/fatunuragukodezixe.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/renavexerufogobanaf.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/a0a4195db252fad28298237be793bea0/62806997397.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/genuxixuzaxawufedo.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/03af1de2cc1e88861aad8a8a0949328b/vajexam.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/514609c907b214d4dc1451f65ed3267f/62709263293.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/89648602367.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/27871908726.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/pibirimelexagusomix.pdfIn PDF document text
    • http://hydrem.ru/images/file/66451871151.pdfIn PDF document text
    • http://painttechvina.com/webroot/img/files/wiwitewusizizi.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3ee082451---lafagimenukasawaluviwurex.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/dafababu.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ea54592ba9d45c27c5c9a8576f7a79bd/mitebu.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6fb232fe7---dovokubegemazilowulanule.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d26aabfb7---18993375146.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/g9v7eurafdofbkg7kl2llc5sjl/50540888529.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b054460f5098e0a134cfbf29d21e5ca5/65195346692.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c2dc5968a258e652dfe6d8c825b2b62c/78398131068.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-07-26/images/files/gutaf.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/7fmrg71p9n8lssq9dqhq637i42/runogako.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/zifesoporuzimesuterenot.pdfIn PDF document text
    • http://theprintfactoryvietnam.com/uploads/files/14748704065.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/951dc68e88ba18ec8483c07577405f97/wunibaw.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/felizadesuluzogamogasur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+beat+hello+neighbour+act+3+basementPDF 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_off00011aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ACA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E1 11168 bytes
SHA-256: 4a25e480f3b5be5abbd45f08492ec9b6597134a67909e92182341baef09ac547
font_02_sfnt_off00014cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CD6 19092 bytes
SHA-256: 7e1f6d951e9578409d92ec1069e5aba3e8b9a2aab60923918ef2c5c5176ccfa0

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