Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c4d0025a26d397…

MALICIOUS

PDF

84.7 KB Created: 2021-07-25 12:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 265175c9010ae596f10e4c6207e62868 SHA-1: 6d9d2723ac3e0f7d99672991ce1d3e60caba63d4 SHA-256: c5c4d0025a26d397e33352047fc2df7a4f41fc3451ed9890f19b7b771fe1dbd6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, indicated by a link farm pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading malware disguised as legitimate files. No scripts were extracted, but the presence of numerous URLs associated with compromised sites points to a phishing or malware distribution scheme.

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 https://www.colline-eternelle.com/ckfinder/userfiles/files/60164627611.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/c523b9c4c9a5f60c5a5885def9c7a38f/61004236648.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6tlrbpgv3rihgch5dqbmpkvu35/zipese.pdf
    • http://shmountaineering.co.uk/wp-content/plugins/super-forms/uploads/php/files/k3c1finjq3i321192rm5hdkhd5/19155718308.pdf
    • http://urparitet.ru/admin/ckfinder/userfiles/files/15878000917.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/917c940a12fb23f846e4eb72423d058e/95763324624.pdf
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/tubabu.pdf
    • http://apsara.ru/userfiles/file/xaxenofopavojalasoja.pdf
    • https://rendiamovisibiliglinvisibili.org/file/xixefifumipigujetugaj.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495115a074---turokilovadelibivi.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160907f4c7b392---50407830393.pdf
    • http://mid-europe-ex.com/images/blog//file/dapewumezodamumebofeziz.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3c2e54e8214dd3de7fee14d2e3428ca7/sojitimagu.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/lusdsi8k6ua26e7akod2guhro1/gojokilozasujuwisamobobop.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/ac61b89862b838b35be30906045f21cc/28926829531.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c68dd61c969---bikawamofevanugogosik.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/3fa10baf1516433f250c162a3a4ec952/97829310027.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/9ff17caa2ffd2a649d59ae4d0f2fae5c/29731532071.pdf
    • http://pphu-joanna.pl/fckpliki/file/41161722282.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4323b470---60260357508.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/06fa7150edf2f76f840fb6769a69b34b/49818198622.pdf
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/88311132371.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=ticketmaster+live+event+tickets+apk
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db60.bin
7ad6c2c3f3f611d6efe81b4e4670d427c60f3d1822fd655b9edb24ef3f236804		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 18300 bytes
font_01_sfnt_off00010a44.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A44 16792 bytes
font_02_sfnt_off0001225b.bin
0aa6be9f26a2a22c9484b6d9fbfbe25b05c899bdfd5eb9c7d6132ea735ef1bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1225B 10536 bytes
font_03_sfnt_off00013a59.bin
34d899b9f9c8ea0b523fc0886b696d6f55cd3a83312b2ac1290801ec1505b895		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A59 1660 bytes

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