Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f3470a98bb37ee…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 16:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98180fb896555b0c546aebbc405ed765 SHA-1: ce31e51e3fa80405466706fbd7243475bfeece4e SHA-256: 83f3470a98bb37ee78600bccb3e819f880a54f571b0ba49cd2f5acc033d6348e
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://chono.mn/uploads/userfiles/files/lituzifumarovew.pdf In PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/vebojanetositu.pdfIn PDF document text
    • http://orthodoxnews.us/file/78323117997.pdfIn PDF document text
    • http://mvsexpo.ru/admin/ckfinder/userfiles/files/nikaxefoxusex.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/7270531632.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/22151248332.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/10099133294.pdfIn PDF document text
    • https://www.rougeindigo.com/ckfinder/userfiles/files/guvejetugepuzu.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-24/20210924174530106497.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147f6a910bfc---luranelarorirojusa.pdfIn PDF document text
    • https://gameclub.by/uploads/files/92118482862.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/namifatexowijami.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/62777022513.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/11123913648.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/lawok.pdfIn PDF document text
    • http://a899.net/userfiles/file/nujamikinawe.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/fegowasitek.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/duvapatoragegajusibunu.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/818825595.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/89907074800.pdfIn PDF document text
    • https://volnynaklad.cz/data/file/96405364873.pdfIn PDF document text
    • http://lovesenergy.nl/file/jaratogisur.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/80896605391.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/ziwafaz.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3d87ff029bd504aec04d5dc2d496c70a/vosoluba.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/ad9ad9327f61569bab8d5dd595c3e2dc/dexin.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/63091955419.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=star+wars+jedi+fallen+order+apk+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB568 14532 bytes
SHA-256: 753835caaa1e2072775e54f4036c7714464df98f52d57eda03bbf7e275773fa7
font_01_sfnt_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 10876 bytes
SHA-256: f3bf19da246a3e4bfd56dc7a75802266045b1401054b4525ba81240575be42ac

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