Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a4ec5454c874a1…

MALICIOUS

PDF

68.8 KB Created: 2021-09-29 00:49:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 14d7e8911e0b92dce0415e107b43f4b2 SHA-1: f4cd1d330551101e6cf35e39d4a87a218772b19e SHA-256: f4a4ec5454c874a1955d33d7b7c554e5269211141da2b220aee551e194bbb1e3
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users to potentially malicious content. The presence of these links suggests an attempt to deliver a secondary payload or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://jnvhardoi.org/ckfinder/userfiles/files/93863870975.pdf In PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/10024126551.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/6br5as31s50v4p04pssli5pj9q/jeros.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/xatux.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/9715638273.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/zizinuserusijewumi.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/88356141469.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/30280701455.pdfIn PDF document text
    • http://honghuibio.com/d/files/neloputigoviwosuwixademav.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/10813505427.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161384ea3dfe8b---24543032479.pdfIn PDF document text
    • https://cape-electronics.com/media/file/relizomivamaregazepu.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/duzaduxe.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210907235718.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613904cf7a221---sosabejajubebixila.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/5nid41a0sli9uaghseraukpcra/84012331687.pdfIn PDF document text
    • http://tercovci.cz/files/file/vozogepiresefivusopagoxem.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d3af26aca9769a5adaa98888da34a454/fisarakakute.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/vekamijexizasi.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/58033517965.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/daxapadejetusewegaverum.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/337550383a43223b2f075c5484dfb2e4/90238303441.pdfIn PDF document text
    • http://mosjob.ru/images/file/78803465154.pdfIn PDF document text
    • https://belretail.by/ckfinder/userfiles/files/48555586804.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/11049038410.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/30490211565.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=free+gta+moneyPDF 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_off0000b268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB268 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA7A 14700 bytes
SHA-256: 7a38510e491643a6db303f77f73a00d650d1b2c2add7cc62275e10fdfbb9d011
font_02_sfnt_off0000eee6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE6 10236 bytes
SHA-256: 4c5644d3bb2e05b49d4cd068c38cba12bfb8e68c510837b95c115870f09654cc