Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0351a1a6fbc7eb…

MALICIOUS

PDF

91.7 KB Created: 2021-08-07 04:51:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 88467dcb54401c71d50e89773278b9c0 SHA-1: 09f611bd55a99295ebf828ed6b148bf3eb3433c2 SHA-256: 5b0351a1a6fbc7eb6c8954bc653e48bc5cae807605a793ea62aa77674d4c9d4f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate this document is likely a lure to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1609465a4bdf10---jebefibekozosaxowo.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d6e4e12c7---18077500253.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e133e4e01---jesizu.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/af2764b866dc47d75e647dec6382207a/nabewus.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/83c6e3b8f677753c65db70f07563c2b7/firororilakotonezu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160816d196b6d1---28277218197.pdfIn PDF document text
    • https://raiporjai.com/piceditor/file/nizuxowamolajinek.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/9f687ffcdef5e5362c8e399ff7ca1c09/71238800575.pdfIn PDF document text
    • http://m2mus.pro/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/refivewovupejoparozobenag.pdfIn PDF document text
    • http://mckeoughfamilyreunion2021.com/clients/b/ba/baf9e6b347377fae0abe5a87436fc4cf/File/22004595762.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/fa9c3103c1a266ca7d8ebf6fc598c00a/gevifomixanuni.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ce6fda70d233330f93b436388a68bcbd/gozapevitojoko.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/sezodavatoxano.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/xexedilikozowamuvane.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607fed776c39d---vetufokotizudide.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/63234660803.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/safuguzuzeferajemido.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/wivoxupuvezotilowaza.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/u8e0ckpf00cejqmckogu7oa7kq/94261625777.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/28369574477.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gutipisulitogepumuxu.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/ttjp985ivoqa5m768nn8dg421d/torira.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/93217503783.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/xunevejivuxodexevizesavum.pdfIn PDF document text
    • http://ejecutivaenlinea.unid.edu.mx/mod/quiz/review.php?attemptIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=metodologia+de+la+investigacion+juridica+unidPDF 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_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11573 18856 bytes
SHA-256: 3f40952a2b5d233282283d787859eb6d0306e21fc855796bdc49c47b7c7c62a8
font_02_sfnt_off000145b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145B0 10836 bytes
SHA-256: ea2eea4e1debc7bfd0ed2c13cc1caf82481d5e91f52a03fa7de74da56ad46482