Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5eb94330f8271e…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 20:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 21ffdafe71e2bf97344e7dee58375f67 SHA-1: 0c9a32dba67aedec4101efeafda2788e26e32e7d SHA-256: de5eb94330f8271ed62955a1a814dd747381a9e234bc65a2dd1af7037216b579
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links likely serve to redirect users to phishing pages or download further malicious content, aligning with a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://infrive.ru/uplcv?utm_term=rename+a+column+in+r PDF link annotation
    • http://pwmtqatar.net/userfiles/file/ranakusem.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/6990111917.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/wusimenobadefadasoka.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210725043315.pdfIn PDF document text
    • http://mwcapital.net//ckfinder/userfiles/files/20376898264.pdfIn PDF document text
    • https://hssanesteban.cl/files/50997824845.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607057c0b7fd5---poponilomoperafifujejito.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3033064a4---59423881866.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/35216762288.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d1f5ddc39---13405459434.pdfIn PDF document text
    • http://guitarenko.fr/img/files/94025137260.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ngd7lgqf07caaqj5c0a99pb48j/7664687522.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/90fe252135afc5115d66ff3ce17abbed/4185286605.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/61008366896.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210810120601.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eacf472da1---81317470643.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092873f7ea65---74166346031.pdfIn PDF document text
    • http://www.fk-fudosan.net/app/webroot/img/userfiles/files/49618651690.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117a7e57c84f---pejekativasefabizogo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2fd04055---wipajonapu.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f88af0b2fbf---56643207522.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/10a533e90431a4b519a473b206805ed7/wopojafesunofowexemogofo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094d5ded5cee---69800599462.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_off0000c711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC711 17544 bytes
SHA-256: b29db8bafb07b444b4852a53c1cdeebbba7f9f93d4a05467907628ed55210800
font_01_sfnt_off0000f46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C84 10268 bytes
SHA-256: 89eb244aeefd0b7614b9d0cd06cdf30d302527d5f14abd580ee535790638fa41

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