Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5e1223e81f12f9…

MALICIOUS

PDF

79.0 KB Created: 2021-10-10 02:15:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 9d09d8fff7f0c0f846e64f9df447b4c5 SHA-1: 79812dd71faa53e917263abd5125b84acdaa1c42 SHA-256: 9a5e1223e81f12f95bde07f4a620f1cfa6c4e4def72bebe5280afac8d21c3e77
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The embedded JavaScript is likely used to obfuscate the redirection or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://krisoc.ru/uplcv?utm_term=30+m+to+km PDF link annotation
    • http://back2wood.de/userfiles/file/79501089174.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/249972674.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/pokoxetesupixok.pdfIn PDF document text
    • http://icbiz.ru/userfiles/file/tadabazif.pdfIn PDF document text
    • http://badgerhillfarm.uk/posub.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/00a5e32d86180a2ee45bc0e263857875/49692779298.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109300914536497.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/zepuvogasitibiwupisak.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161311837e58e6---74298016371.pdfIn PDF document text
    • http://htwy.com/upload/file/guboxupexufuzabin.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/bizijumunu.pdfIn PDF document text
    • http://jacsonsfurniture.com/userfiles/file/16909683644.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/24526563948.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/57114344725.pdfIn PDF document text
    • http://grotech.in/userfiles/file/visogeramoxatem.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210917_6DC0B0AE828B3190.pdfIn PDF document text
    • http://geoass.eu/userfiles/files/sarunaxaset.pdfIn PDF document text
    • https://balajihighfields.in/userfiles/file/64493569685.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/kebaxovujuvukevivefezexod.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b6b401143074c45c390f676fd32b2839/19713239349.pdfIn PDF document text
    • http://peak-experience-japan.fr/images/blog/file/91194997945.pdfIn PDF document text
    • http://dymenahealthcare.com/upload/fckeditor/file/11386038173.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615845dde1be3---jibatejolilana.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/zixujopugiguxanadekul.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_off0000ceb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEB5 19400 bytes
SHA-256: 825946a130f2228b7c0a4cd23750806f9f82d75f2d545614e9bdc520356dd397
font_01_sfnt_off00010146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10146 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001195c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195C 9756 bytes
SHA-256: 821013a86da5ed1f0293130b0817cd6b8934f8c536c7db151c3738995eeb9414

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