Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d99fe70a415d296…

MALICIOUS

PDF

92.6 KB Created: 2021-09-15 13:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aedc4b84dcafe317a0988b333a80095b SHA-1: 63e1e3377815a03cb47c5086c7a99dfd65523f1f SHA-256: 9d99fe70a415d296d30e3c416504510b3874920523f6b09c2432211cdc73302c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. These links are likely intended to facilitate phishing attacks or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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=smack+android+example PDF link annotation
    • http://myoffice2561.sesao33.net/UserFiles/File/76301575505.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/nuriripibabumuje.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/23560484848.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/xejodaxujep.pdfIn PDF document text
    • http://coomargroup.com/ckfinder/userfiles/files/134486901.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/e4lor3kl57e13gv6inps1js3d6/41542317439.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/57484469474.pdfIn PDF document text
    • http://rayanchem.com/d/files/rutonefupuxarinanirik.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/vagina.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161416f39cc299---jazevulelaxobowuwumef.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/pemuposidaxanibojosegixo.pdfIn PDF document text
    • http://rilta.net/userfiles/files/bafekipisodetizudi.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613007f129f48---48839181885.pdfIn PDF document text
    • https://shibbirs.com/media/files/xenatowameduz.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/dsllqg92gncgn42bhkos74n0rk/23402100811.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394fa4d2472---bareranososibe.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/xuwofiwekuzafuvekiwup.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/8720b097de73c610fa20a1118f572f1f/zijomuwilifikel.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210904215653.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e35de5b70a---korajiniratapabe.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/24189943995.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/40903949244.pdfIn PDF document text
    • http://sun-dr.com/uploads/files/202109020955349455.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210904124758872.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/vugabozetorusisivudo.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/wijafijido.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_off000102c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE0 10680 bytes
SHA-256: 102876b0f23d94654696c6393d6633c2fc2f35568166a7ba385bcca4bfe4b600
font_02_sfnt_off00013345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 18736 bytes
SHA-256: 6637677f398350b2fd8c61833b4cbc85610fa567aed50f89c0a54d65991b3fca

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