Malicious PDF — malware analysis report

Static analysis result for SHA-256 5136b6dc7cdbc0d5…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 03:36:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 43f148acc32ad5a4af3e6c5e19b79d0c SHA-1: 4023d17677a8e2661cdf7a80b134b38181279e8f SHA-256: 5136b6dc7cdbc0d55b0fb05e27c9e394dde136b54dab8526becdee3039324051
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution, aligning with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pixomot.ru/uplcv?utm_term=how+to+download+paid+apps+for+free+android PDF link annotation
    • http://red-persimmons.com/upfiles/editor/files/jetonagusor.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/soren.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/meritevafepogofanataba.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bezikodutalis.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/moralefowixala.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/mejirowudosa.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/gaxuminagepate.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/60013119210.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/66477586288.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/03dd4c2c92328a92d4b02009d8258559/70652948035.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/77928992704.pdfIn PDF document text
    • https://www.willmarareachamber.com/ckfinder/userfiles/files/23296009302.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/mukute.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/fovopanelowozezujutere.pdfIn PDF document text
    • http://onlinevay.com/upload/files/zofowudebu.pdfIn PDF document text
    • https://stvorki.ru/files/file/topalogofobe.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210907062706.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ecae82d5---1645152770.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/12385670381.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/37349917560.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/gejelotilezifenemukaligi.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/96877204178.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5k35rikcees0sbd8fbd5h266e5/62706716800.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/83143546741.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_off0000bc17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42E 10568 bytes
SHA-256: ad785400708dc0cffecd15e65988053cd5b4a5f92f62f684faec8f25ad19d817
font_02_sfnt_off0000ec68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC68 16736 bytes
SHA-256: aad971c1a7309b395457e2e25536de71870d75ac73502181fc9f718f7b08c214

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