Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c54aa28702d200…

MALICIOUS

PDF

84.4 KB Created: 2021-08-01 09:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 10753fe2810a0b5b9c5abcb64684b08a SHA-1: 56f77bbfc7f82e2a08fc2424287ebd8f990319e4 SHA-256: 09c54aa28702d2009b1fabe794814a28d2b1bbfce7d10496fbbdaa49047aea24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://pixomot.ru/uplcv?utm_term=dibujo+de+medios+de+transporte+terrestre+para+colorear
    • http://jubileejec.com/userfiles/files/sizosibugoj.pdf
    • https://bititechnika.com/uploads/file/gofaletiv.pdf
    • https://gelblighting.com/userfiles/files/nevutu.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607325fd0e521---72806647812.pdf
    • http://gayaarchi.com/userfiles/file/20210617123015.pdf
    • https://weborder.cloud/userfiles/file///noxaginu.pdf
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091194840bc2---84553061093.pdf
    • http://cdhsalumni.com/clients/28864/File/11147987525.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160acd6e13c85d---wagexekodasigelukefo.pdf
    • https://myphi.biz/nbloom/fckuploads/file/nesaverakafuwaku.pdf
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/8db4e14e41f0f96a08d3737c77d431c6/fosumitoxarojetanano.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a1d0886f7---jolubikupuvel.pdf
    • http://sosonomo.com/ckfinder/userfiles/files/karewemozokusekawijivefak.pdf
    • http://bigcool.net/webroot/img/files/bifilodemefifa.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/qnkji9fojme8mf9nmb8epjl7b4/salapasaf.pdf
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/31513641457.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098151aef9f9---13505067586.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b02fa19440d7498d0c60f2dc7f0fc2dd/povoxakedewab.pdf
    • http://satakantaresort.com/user_img/files/gozitunuzebinaxifux.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/d023894caf4824e7e16ef18a6f82faca/58264454011.pdf
    • https://digireg.se/upload/dixebizofavijexidamow.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_off0000e619.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE619 16792 bytes
font_01_sfnt_off0000fe2b.bin
879b9d3dcfd31d544c817a74c9e156cf5bb3d09e18a370179d903fdf31b07671
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2B 17588 bytes
font_02_sfnt_off00012a7b.bin
d687e6b9096b842753f92b07254de8d41f228a347a882ec73bae60b9cbb1b1af
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A7B 11044 bytes