Malicious PDF — malware analysis report

Static analysis result for SHA-256 9127faccdd7f0815…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 00:14:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd4603044879349ab2663f2a1e25c5d8 SHA-1: f60aac7e926e74bc492ab2d0d9b6baceaa085abc SHA-256: 9127faccdd7f08152790d48061fa9741ad0e361522c821c16e93878b6ab22d25
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised WordPress uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://maciejabramowicz.pl/upload/files/file/xozizufozo.pdf In PDF document text
    • http://lamorenj.com/userfiles/file/vexuvesojone.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/64768743554.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/39193478484.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/24274213467.pdfIn PDF document text
    • https://www.bandungpilotacademy.com/file/31480783191.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/pavivivud.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/61806809430.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/1534128673.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/8423983290.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/51054840108.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/japoxufipikapasipidof.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/61917995707.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/71150245347.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee623ca842---31878421513.pdfIn PDF document text
    • http://kuresi-kaitori.com/upload/content_pic/files/44433784730.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/aa57684cfd9f7e69b88d88a759391ba0/17738348318.pdfIn PDF document text
    • http://saraiaser.nl/userfiles/file/gajif.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/26026348803.pdfIn PDF document text
    • http://avtrak.ru/ckfinder/userfiles/files/zifezolokoxadeloziluziz.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/vijifoxusu.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/bolukogawazofigik.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615703d25d402---17623258777.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/92277850584.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/26928740379.pdfIn PDF document text
    • http://superazs.ru/images/news/file/31951869416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=online+screen+recorder+for+macPDF 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_off0000b108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB108 10564 bytes
SHA-256: 15f75698759a256e4ec5a2b5136dee2fd47789d16e9e9efc4ac793c4cfc45638
font_01_sfnt_off0000c91b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12D 16764 bytes
SHA-256: 4e7c214aed41cb723f6336527bedde04582f570a3f2ceefed61b071f2394e05a

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