Malicious PDF — malware analysis report

Static analysis result for SHA-256 550e83d8d4927424…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 08:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 313ab4707953d4dc7d58d69e7ebf290c SHA-1: 4e4c5aba30a4c0687ba8b041a7aea27236195c42 SHA-256: 550e83d8d492742492a75e20deef757363dac08ca1f6419153003c5d5c6d23d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. The document is heavily populated with external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm likely used for phishing or distributing further malware. The embedded JavaScript, while not fully analyzed, is a common component in PDF-based attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://archism.ru/uplcv?utm_term=big+rig+racing+download PDF link annotation
    • https://chief-moving.com/editor_upload/file/65433978528.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308ec84f7b5---4559167847.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/28655026401.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/fikexoke.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/35413471522.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/telimupubuxazufuta.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/36015068220.pdfIn PDF document text
    • https://aynispirit.nl/userfiles/file/78157800297.pdfIn PDF document text
    • http://iknow.pl/files/file/79356802050.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/roxetutuga.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/26836321302.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ca0f1706bd48793af098b72515fa85a3/dufetiboxoxexekajidoxov.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/65603703533.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210911061250.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210907041325_b5yn2o.pdfIn PDF document text
    • http://surestegc.org/documentos/file/kebowejiwexalilawulo.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c7f30ee30---femapuxikiko.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130acfa9f0c4---40308100311.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/monuramatasiwav.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/24023647219.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/47ebd57fc283a2a9b81856dab848d8ff/nudojomozogelo.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/7692574568.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/b71ada3da1603b31353c68326cb8f389/74816331474.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_off0000cbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBD 10284 bytes
SHA-256: 4ac68bf8f6afec9d9da01c30c3523cded142ff850c3abd084453c2103b97ae01
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 17080 bytes
SHA-256: 9384c0dba0e433457a34b8665f7d099abc428b99a653631f21d0bcc9dd57f997
font_02_sfnt_off00010f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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