Malicious PDF — malware analysis report

Static analysis result for SHA-256 061ea9473fe01535…

MALICIOUS

PDF

101.8 KB Created: 2021-09-01 05:34:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6577cfed8008c502d8511b5a3f01593 SHA-1: 06e88d506f8d213a3d1bb916d41d7effc5a74655 SHA-256: 061ea9473fe0153555eac255f67941907ac59c252770d404ee346af850db4b49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/acc0524c091a1a8b9db2512a1e02a2f5/93727072805.pdf In PDF document text
    • http://k-souz.com/userfiles/file/dijarejazozasudixo.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1c0553aa---17299107570.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/votufiwitivexezeloxaxi.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/fanilifel.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/7367803400.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160728e9e530d1---98648526628.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/92626926389.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/lepasaxulagokawaxutapim.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/gefelutajuge.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/giseriropalikobatubi.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/h89ohfilffs6vlft4jmh7h8ijg/xoxufo.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/185c08650ec7cc9eb3ed676d37814c18/5344470541.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/22773258536.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa72ea22c5d---fawagezi.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609abe79a93f0---98303010732.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609924d7e3ff4---vepiwumawelivemeluti.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021530453233504.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/sogila.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c566abd22ab---27313971375.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/oe1tt25p9kde8lmd7jmc29g0a3/21496091453.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/40896105733.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/tabujaxenonefar.pdfIn PDF document text
    • https://relaxbotanika.cz/ckfinder/userfiles/files/13614060889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=personal+selling+and+sales+management+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_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 10840 bytes
SHA-256: 11216ad1b85f84fbf70c6cf8eed165c0820c79c4943e29984279e2a6d8206f2b
font_02_sfnt_off00015965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15965 18268 bytes
SHA-256: b91f229ba8fa4727570810053c6e927b6d27ced467e43b6d76cecf585e42585c

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