Malicious PDF — malware analysis report

Static analysis result for SHA-256 398f4ac9be2485a3…

MALICIOUS

PDF

93.8 KB Created: 2021-07-14 08:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8b20e85615c3259c87850c68d8b2c7cf SHA-1: b1a94166c6ef25fce760b514a5892190e891dc4e SHA-256: 398f4ac9be2485a3586461e9ac860d90cd4d171a9a8820e2e3c3d48775a3f7f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to potentially compromised or disposable hosting domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://rc-modeller.se/images/file///xerenib.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/dojeifub1o5b46r27ran22hftv/vipedewevezugevunovava.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cf980a225---ladanefidatusunavajulel.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/77301118221.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210507135452.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/75388722863.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/c9ce72d4d17704de3f3cd36f750b02c3/11777920754.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/50mvog3um0etnijgo54rpke2jl/61155290255.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/40021562482.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/dhjgrpik7hta6lgmajvkj4k1o9/ketudaxafodovuzuxuzoken.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b8a23f990---juvetedarevutirebifibon.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccde94b66e---bedekum.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/a2697e6526413bcc0d70a758bdb35a20/dupatinuna.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021061500425773499.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2f492e254---gimotusesuzigakedikit.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/80993765445.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210530_B90CD0DA2DCD49CB.pdfIn PDF document text
    • https://aspirans.com/files/file/detelosirewu.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/66894840777.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/e2e362f884c42e903d0a86441207d621/67506974559.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/natorutudulebasujepozi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/37lbv9hdk7ui85e0ged0f3pr41/kixivixawazoxonegobib.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bba12607a35---munojofoxapemipoxo.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/8f7f768a099bfd8d2ade383672d1510a/84241798363.pdfIn PDF document text
    • https://www.geo-decouverte.com/ck/ckfinder/userfiles/files/82819432341.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16084f0b22b4ea---77141462168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=toast+with+a+facePDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01C 18880 bytes
SHA-256: b701a4006f95a6745488d40df58efdc981d12555fd553c9baa4aa318778915b2
font_01_sfnt_off000120b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000138c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C9 10232 bytes
SHA-256: 64b2d48b6945e94cd495d2290332ce54333be8068eb717cc03ba42c10c720fc6
font_03_sfnt_off00015004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15004 16928 bytes
SHA-256: f85b58f09311786573d309329ab3dc942a17783161326da6174de9e6b7509e1a