Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd31e389549c6dd…

MALICIOUS

PDF

102.2 KB Created: 2021-06-27 22:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 854798cba3fe2b2a4af392779afff3ae SHA-1: a1be8f3f6e6c3ebcd0bb6f940bd8f151be5066ff SHA-256: ecd31e389549c6ddb359b8a5c2eb27d5c9e80c761a8855a6390ff2f96a8a11ff
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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://krisoc.ru/uplcv?utm_term=what+is+the+general+form+of+a+single+replacement+reaction
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1566c2b7---59700917815.pdf
    • http://accronline.com/userfiles/file/mixile.pdf
    • https://a2designbg.com/userfiles/file/notaxulimofibisaruwam.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/afvuqsaahh1enbf5ui74770ct0/79383341310.pdf
    • http://lawrence-spruill.com/clients/42275/File/muzazokekorunuvov.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2221325522---linotuzisebiwiregexowifan.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35d471871---94258652123.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/1cm3rh3eidahagta7sar0ah0q7/benuriposetofe.pdf
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/narapusugufebekabupimelig.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa612883a7---mabisamubuloduteki.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d0c94624f---99238187031.pdf
    • http://vrtaspol.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/51122324067.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ocejlc8hbt2ntmn87c0vu43c7d/71731174018.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec7ea4fe6---govoj.pdf
    • https://altonika.pro/files/fck/file/laxubowodowopijusidos.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/ee20debe5e712104906fca72c4616e2a/39121643793.pdf
    • https://calmoinc.com/upload/editor/file/54011812590.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bffbdb634b---82435333680.pdf
    • https://realschoolspirit.net/scauserfiles/files/87531925989.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/dc4267db07477e096c06bcf1d77e6d5d/giwox.pdf
    • http://bbpcosmetics.com/admin/upFiles/2021-6/file/12305728755.pdf
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/guwokotenefebomimu.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160729e956c738---likukoxawodalutolokas.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111d6.bin
a653a5e2007019e9306305fecc81a54ea08b3359a7a9cf357aa49e0dbd6937ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D6 18100 bytes
font_01_sfnt_off0001419c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1419C 16792 bytes
font_02_sfnt_off000159b3.bin
f8f0a6ea2fce901c45574c4c823ebeb322cb1262713787d7d7ba45b8b6251162		 pdf-font-stream PDF embedded font (sfnt) at offset 0x159B3 10920 bytes
font_03_sfnt_off000172d0.bin
1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68		 pdf-font-stream PDF embedded font (sfnt) at offset 0x172D0 16168 bytes

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