Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9a8d909a40f496…

MALICIOUS

PDF

75.7 KB Created: 2021-09-25 03:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7c0f362afb0298f751d462f209b5a206 SHA-1: 13dd2ce09308c12788564e20a30fc71ecf414d77 SHA-256: 8e9a8d909a40f496f2667637bb2bed4fac7cf12de0ebd3b48af360a2480d8272
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating a tactic to leverage search engine optimization on compromised infrastructure for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://medvor.ru/uplcv?utm_term=como+acelerar+el+internet+de+mi+celular+android PDF link annotation
    • http://swatimishra.in/uploaded_files/userfiles/files/gogalopu.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/jufir.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/66605269870.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/44716620345.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/22181644a131aa96f5a40b20ba57aafb/85809529691.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/80561104759.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/30754925302.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/jikupikipezakawuxe.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/vatedaxijuzapemuzuwisate.pdfIn PDF document text
    • http://thehbbq.com/uploads/files/84149726953.pdfIn PDF document text
    • http://lovesenergy.nl/file/wokunuvigufurirawivop.pdfIn PDF document text
    • http://yansyuan.com/UserFiles/images/files/mijomujobubapijemamimine.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/30512630104.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614189e99c05f---21908529953.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3208a0c13dbf03b07fdd24194382169d/gewotokovu.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/4613985701.pdfIn PDF document text
    • https://mihalex.by/files/files/simobix.pdfIn PDF document text
    • http://giaexploring.it/userfiles/files/lojugesibimawazipuvawe.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/kirajopefinefazafevunew.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/riwokejarupagubo.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/55974771724.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/wamusemazovugi.pdfIn PDF document text
    • https://akgoz.zemta.com/uploads/files/48546095833.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/66422728269.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/89331837759.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/69159994632.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AE 18628 bytes
SHA-256: b8f2cc931aa8c8e38fffa85d0286b76e739b47fa0121c9831cad3e48fb89ed34
font_01_sfnt_off0000f0a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A9 10492 bytes
SHA-256: e180e9d650a5750e21339f7da4eb8d195445cc5a9102986e29693c4a57973e7e
font_02_sfnt_off0001087f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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