Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5cde1cfa59c032…

MALICIOUS

PDF

86.3 KB Created: 2021-06-30 06:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4078b5c743fc5da2b7a985d0a40029a6 SHA-1: ef02b8eea9e58954232cdbec3bc8233d1f7e7483 SHA-256: ea5cde1cfa59c032725e15a66dad516722ad2ee7a0356c5b5d6ba55a6e3bf0b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URIs and link farms points towards a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://aucoindeshalles.com/menu/file/salakufi.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6ff60d68e---gotijepawajurul.pdf
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/susuwusakifabat.pdf
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/68305318515.pdf
    • https://atcotourismtravel.com/userfiles/file/58427673347.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16092bce6b79ee---54251129674.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfad69e1b9---dasokegasasefuwuduvuzezig.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/icr6ug161jcoifhnjr1omgq91m/78576616843.pdf
    • https://quatcongnghieput.com/uploads/files/fawexafasew.pdf
    • http://aarogyamedico.com/userfiles/file/63821667071.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/2baa6b77c80dd672debe08e5000d2748/46868619996.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/bajufedoxamomexuzip.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe506b157---sugokegajidibakiluliv.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778d089daca---79692601238.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/b4ndf82tqq8dpdkouv7sdnskg9/73863994713.pdf
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/f9fe0e2a6e601a3074afb03cdcf5fbd5/winokuxuwi.pdf
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/6697ee0a0125094fc36108eb4a22d87f/85777144802.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2dce2949---wabovabimefamufusezo.pdf
    • http://thetuckerfamilyreunion.com/clients/67950/File/36759251825.pdf
    • http://shinies.ru/img/lib/file/60601532061.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2cc548f6392197c140ff590a7c198f38/42627904042.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a155bb10060---jojinarazunepexumudixex.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf2f9cf09b---tegezimabid.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pacifier+teeth+in+adults
    • 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_off0000f16c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 16792 bytes
font_01_sfnt_off00010983.bin
a8344b8e85324bb9835bc8c36c71f56eeb77c2ea9655d9969f702cc9536d0638		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10983 10556 bytes
font_02_sfnt_off0001217d.bin
598699ddccb9c1cbe67ad3198bfe9157ce3d07719a0ba8bfce4c7a0fc00645f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1217D 16464 bytes

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