Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6344a862012e1b1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-13 21:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4413344330777a6f4d8542bc62c7af7d SHA-1: 38e858ba0626576e79e0598c0075516dffd868b9 SHA-256: c6344a862012e1b11f111baec61d0ff29f0edbf8fd5b256d6231adf356c74276
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, some of which point to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://bangdientunhk.com/upload/files/rasapafagujuzefedesidu.pdf In PDF document text
    • http://factory-01.com/js/upload/files/xepetaniwarevibekikipuluk.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/65302875949.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132630dc91d0---jakopojemetexupovuzug.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/gigagasivevosesob.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/bosawututavizabogibo.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/59209016801.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/tepevunanepozufijiz.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/90789740212.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/zakuputipexosutipakupit.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/piminakijok.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/vatunaxifosemip.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/gijinuluxotovi.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/25838472462.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/rixowisudojiridajimi.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/fenupuduror.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6kbfm89gfrrr252flu5t78r607/68898400884.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/10271449600.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/lexararez.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/11676851806.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/53522380191.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab7bba665---givawotexizofiwevi.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/kekekefujefurowemofumudum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=watch+home+alone+2+online+free+putlockerPDF 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_off0000df17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF17 10880 bytes
SHA-256: f9d525c38e1c94b9de62d7ed4a5b393314eb4ab6e1f987dec1d1744dc582c91f
font_01_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 18232 bytes
SHA-256: b0ea85ecf9c142761dcd0aea1b72b8b96b873755303c7907a863e0da9a200a9f
font_02_sfnt_off000127f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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