Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b6e112d9a921309…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 08:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 621fc7b5a8d986193e03f6c8ca646e2f SHA-1: 453659b5479ed07941f3d20e466736fba3dac16f SHA-256: 7b6e112d9a9213099b7cb82e1ecd5d22f0704ebc3754a232973583a94256106f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=things+to+do+in+jasper PDF link annotation
    • https://signika.pl/Upload/file/62795528714.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/pezil.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612b3dc81c66e---nesene.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5e46babdd---gagubumemosilabokuzeka.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce33e3f2d0---83378063192.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/pcd5qomn9chhnf7jqlnm9h0u2t/43589364667.pdfIn PDF document text
    • http://vrakskodamnetice.cz/file/77555695101.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/45834233987.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/lagaxumax.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a64c35e4---rokikokufadutovemawimudez.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b773e19fb---rawul.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/1f4de664be5329df05043832208de6aa/29593723015.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/5591969048.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/18035012915.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa965b6fc8---pepadori.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/ponukonopobixunejodifova.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/33619591656.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/59022010564.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866fd3c1cb5---diwaporapilevojawubo.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/puxemosagexututabexiwunud.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d808cc936e094bd64039b2a3f8e9e89a/tiluvikevisanogape.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609254dd9833b---rabolubexevefaludit.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607b37423ed4e---vurufulewedavotagevu.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/2e608a1629e1ec5cb7654d9cec7ad25b/jemivalewubekabiruzuruk.pdfIn PDF document text
    • https://promaxsuspension.com/csmimage/file/rolifededupubebelegudoves.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_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 16800 bytes
SHA-256: b64a6ca4e91cdd3e81ea02bf5159c055d3ffe426cc75373dcb0351aaf5c18421
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 10720 bytes
SHA-256: 2237e97e22cff35d04710eafa9695d2fbbf767615a70397663e4dc8c74124152
font_02_sfnt_off00011ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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