Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c74d54f25aae503…

MALICIOUS

PDF

75.4 KB Created: 2021-09-04 03:32:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 990e09fa8db898e60f0e0bb8ea154581 SHA-1: 410f194e4f611d3216379fe2c7eab019a984fbd8 SHA-256: 9c74d54f25aae5039eecae698e58560ce20cbd03405526cf03627bf9d16f465a
164 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous links to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content or download further stages. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=how+to+convert+pdf+files+into+powerpoint+slides PDF link annotation
    • http://morard-mcf.fr/data/Files/15719941243.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/94979935969.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/45184037883.pdfIn PDF document text
    • http://goref.ru/files/file/zivatupunavevo.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/jibevag.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160fe96531ed81---66166705732.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c90b029989---sajefimilavawa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/lodanenipuv.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/ff1e0753253faada55b1022fa574ed47/87976054377.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607998a615cab---47358924138.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/gipidufebe.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/fesanevozujamato.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608633fbc6e6f---faxaneruvinofagukanamosil.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ade13e2a54d9c103d529fb073aaa1101/jebomizimerob.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/xufunetugamurajobibibepi.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/15037985a8bf1b9375dadaf338023fb1/gixenelutix.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/fatoxawo.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6586dab796---detazugovarafepadunuv.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612d3d21a988b---tarotapunedubofojodenez.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844df5e98b0---40216794217.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1c446ed9d---64374212984.pdfIn PDF document text
    • https://oklogistic.lv/upload/file/gowakamesitubisisakaf.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/a989ed8246f4e4e5fa5232dd451a13b4/xinilivegima.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_off0000c37a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC37A 17156 bytes
SHA-256: dac9d93e22c81863deee60eddcaf02bdb600a5e7914c798c793bcdcaa8505f13
font_01_sfnt_off0000ef95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF95 10592 bytes
SHA-256: 1dc7b6f4f0a304e8be45f4f767c083e904d7a4b405581c2735cbeecfeeee12ad
font_02_sfnt_off000107e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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