Malicious PDF — malware analysis report

Static analysis result for SHA-256 51059fd6f2bb0169…

MALICIOUS

PDF

99.4 KB Created: 2021-07-06 16:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2adea5e5d37ccdedd1992389f3bfe3f7 SHA-1: f17fcdf40f68f22c55a455f454eb199c10e1ea9d SHA-256: 51059fd6f2bb0169d5f187f72498b4ad222fbe7ac035ab2ca8455723958464a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to malicious content.

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 https://garglob.ru/uplcv?utm_term=both+teams+to+score+bet
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/zafagabego.pdf
    • https://alate.org/admin/fckeditor/editorfile/vazosubibarikes.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/fb50a53d898ba54b9bb28b50be1d711e/faturof.pdf
    • https://sankaibearing.com/userfiles/files/42295520513.pdf
    • https://digireg.cn/upload/81459836639.pdf
    • http://altinay-law.com/images/file/gowonefexifijegezudeze.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160873d40adcc0---mipivuxenotevepi.pdf
    • http://nemdanangpho.com/uploads/2021-05-29/images/files/nisotazapozawakaminunugip.pdf
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/fc5e23ef22d72423b4301791c1c10df5/xamigasawaj.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/vmndj1dnnhvmnod73vkscfukja/xoneriperelovid.pdf
    • http://foodsafebox.com/ckfinder/userfiles/files/welevipemutafoz.pdf
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/26079468979.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/01fth89lbpi2id9a4qqsonv8id/sojijulikezibonekenaj.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090639660768---tavoxabofinutasikoxur.pdf
    • http://bawaconstructions.com/editorData/file/24389075479.pdf
    • http://fly.no1-yes.com/userfiles/file/litomupawuzapakopezimijo.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/58f1739a55bcfd46da40899c42c58e59/52605857892.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/25eakj3116mbe8o2opppgsv692/57462343275.pdf
    • http://nedirajtebosnu.net/userfiles/file/40902379046.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c7a960dcee9---91007563300.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/71216cf32378b389bfa4c0c4cd7d3f98/sabesojufomumiji.pdf
    • http://busangh.com/attfile/fckimg/file///20210610193116_251031591.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000120b3.bin
7273bffd3ab609674e3ea71995ef28fd2c33ec9cfa3ca8eeb1a314b3a3f26a3f
pdf-font-stream PDF embedded font (sfnt) at offset 0x120B3 10444 bytes
font_01_sfnt_off0001387f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1387F 16792 bytes
font_02_sfnt_off00015091.bin
02310696330409ff6e928ad90208b6cf620bc57ff56225b5eab90a8f2e612d59
pdf-font-stream PDF embedded font (sfnt) at offset 0x15091 18076 bytes