Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8e129b74c725f16…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 02:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e2b71db0d3c295596a187e0418ce864a SHA-1: 9dd344c49dc8ed0eff5ffa6a8f0450555d2f470f SHA-256: d8e129b74c725f1680ce32d0956cc70a3e7dd1c74167e5de449773a1d627709b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://huntic.ru/uplcv?utm_term=download+play+store+application+for+android PDF link annotation
    • http://gamax-motor.cz/data/dokumenty/69175612952.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/nivugagoxusikotewiburiraw.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/97921399159.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/73143955559.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/turuzalejebuzeb.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109232021095487.pdfIn PDF document text
    • http://profiklub.sanswiss.cz/files/file/40365815628.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161464a33b2aa4---gupebefo.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d0aee898a4---bererudu.pdfIn PDF document text
    • http://islenapuntos.com/campannas/file/kazanulixorigitila.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/junuxus.pdfIn PDF document text
    • https://masukpt2.com/contents/files/2461988349.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/rivera.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/86620136827.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/75047258737.pdfIn PDF document text
    • https://www.elshandmadedesign.nl/ckfinder/userfiles/files/12342942064.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144a9f95219a---58466507914.pdfIn PDF document text
    • http://schokofontaene.de/idata/rutojojosofupazesigamap.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/eb55ade2aa2591255ff927c9d1490046/63147502266.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/14879807877.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/37834807431.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/24932892320.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5081864a98c237d8b05ef4e8b590eb64/ripojizuxu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202198194769386.pdfIn PDF document text
    • http://jarosi.hu/files/file/xufufuko.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/1897735968.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_off0000b110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB110 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC927 10816 bytes
SHA-256: 6338c4aa17d8dda64088937edda30bf885b969a645c90308592a9e8cd2beed8b
font_02_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 16084 bytes
SHA-256: 93406d6e5fd29082b81b3275e89bedef00fb32b3ee7e9085b2b3fb1a91ce1792

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