Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c1a2c852acf48f…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 13:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2f3c8a6808794cd0b93b474e56cf35d6 SHA-1: 83df5f95e8fd21ac96e086ae6e01a6c4a9afc787 SHA-256: 15c1a2c852acf48fcd13d8551d1b906cd5c353f607ccf61bf1e506fbe3e737ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. Multiple heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to distribute malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://krisoc.ru/uplcv?utm_term=indian+railways+official+app PDF link annotation
    • http://ttfi.org/app/webroot/userfiles/file/69715139137.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/jenanafojaw.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/39207399779.pdfIn PDF document text
    • https://rajatotogroup2.com/contents/files/fajudoja.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/tabopejanumo.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/duromagimividepaxotojub.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/458a23722df823e16bde631305c874dd/tabosemotegaze.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613adfa4a2a4b---29621138047.pdfIn PDF document text
    • https://birotex.rs/images/files/64665949481.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/92060781344.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/nizudi.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613056f91cf76---99351492989.pdfIn PDF document text
    • https://iwistw.com/upload/files/69289295177.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b0cde458aad07a127cdaf59120dc450f/87172755749.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136563be7bfc---taguxufanesuxelenopaleze.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/836762905.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/wojogurulasizidojerosedad.pdfIn PDF document text
    • http://zgic.ru/!upload/files/6955949170.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/73280272864.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614288b35e728---bobuzamedidinulawo.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/lejutanusup.pdfIn PDF document text
    • https://hw-power.com/uploads/ckfiles/files/614a0616cd7c1.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4da67893---65151971546.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/buponepisiketewitupofam.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_off0000dee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE0 10536 bytes
SHA-256: a87bfd9f3b321517de5ab40e72ca69d9f40a00f22274e536479f47bfffe88cfc
font_01_sfnt_off0000f704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F16 18572 bytes
SHA-256: 478435dcb95617b00418e4c7533f18089557d521cf69e6e2343dcd4fdc6160f1

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