Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89d594b0cff6ea0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 00:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c3709f963e236072fb2dc25cac3ed9fc SHA-1: c8c05d2ccc52f86a82569c6a3b6ac8aeade30e23 SHA-256: b89d594b0cff6ea0d23775bd1f44f6a28aa4fb0e00eac4b3309c8a9ce45b5dd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=requirements+analysis+document+pdf PDF link annotation
    • http://littlepearlbooks.in/data/eimages/file/29434328668.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/sukinujuviloto.pdfIn PDF document text
    • http://shinex-auto.com/userfiles/file/1993646291.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///78525601829.pdfIn PDF document text
    • https://redac.ch/upload/weneluri.pdfIn PDF document text
    • http://say-international.eu/userfiles/file/tojoponagowugusukagobe.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1103f5a3f2---87042472692.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/43bqhjsm5alc6h8af491nht2u5/52185034515.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/63503697059.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/zovefurexigujor.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc5af01356---sudipatupedatorerenu.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/pikatovoxofesolexewod.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/xerorasivusekawurixukoted.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/ripuvazizafijas.pdfIn PDF document text
    • http://teraval.cz/res/file/bepofuzulisi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1904177fb5---libavemafuvebiwu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2075732fa8---buwokobenenamafobusizi.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44bd35d5b3---16739947650.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/50428296574.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/zujulixejakuzulejugi.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608162d4d01f3---nujodugenozuru.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/degifugejixokiwonuzafotaz.pdfIn PDF document text
    • http://klefmarken.se/upload/file/nifewotomutesoguxowupew.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a3900c42e85499329de64415ffdfc6de/92626701903.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_off0000ddff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDFF 17300 bytes
SHA-256: f11aa705782b6edb29f1c699deb2e9729f723e9848647f2daaaf36331398c09c
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 11188 bytes
SHA-256: 639902f05f11ba789b3a1950cbe29aa896192a3e0b0a0801a3e73287b6372df4
font_02_sfnt_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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