Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa4e73c64297049e…

MALICIOUS

PDF

93.1 KB Created: 2021-09-23 08:00:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1801aec11c70910ed6f7a3be1f5ac4a8 SHA-1: da96216790978b4ddb9f60551318100c27109694 SHA-256: aa4e73c64297049e2a1518379293d3cf55127c964ce11243be261a17a3721050
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript which is flagged as malicious by ML classifiers and ClamAV. This script likely redirects the user to one of the numerous external URLs found in the document, which are associated with link farms and compromised websites. The presence of JavaScript and the redirection to external sites strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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://huntic.ru/uplcv?utm_term=dsm+v+fran%C3%A7ais+pdf PDF link annotation
    • http://juditphotography.com/picture/userfiles/file/kewufiwiwinowaroxonazi.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/xesudidasonagujapomakuzib.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/77654994541.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161382d9af1852---79906440217.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/magoteduvat.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143a84d7a20f---11164848376.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/75098270349.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/bemes.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/92353426309.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210910214910725.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/83722999414.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/fafade.pdfIn PDF document text
    • http://tochalco.com/uploads/files/63470065491.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/risisixonolagoza.pdfIn PDF document text
    • http://gzcaifeilai.com/ckfinder/userfiles/files/202109072250168171.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/7e1abdf61b35f21588ae686f494c3b55/woboxawigusarofiwawupu.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/92121609204.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/11353649486.pdfIn PDF document text
    • http://fatamorgana.fr/uploads/assets/file/43702160378.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/4f7a07fd787379001a13fac89e20f75c/zametixiwefu.pdfIn PDF document text
    • http://zuszdounky.cz/files/20507442955.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/ralolo.pdfIn PDF document text
    • https://lochoanggia.com/upload/files/37076468250.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/95152523876.pdfIn PDF document text
    • https://ijpdua.com/contents/files/fikesupafilotekebexawij.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/pesukifolo.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_off00010061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10061 20956 bytes
SHA-256: 54c3558d8d9fdb19bd2ddd86a6b1fad05437fa3a5d4c64bba1d9a1d1ac0d8b3f
font_01_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 10528 bytes
SHA-256: cd7c879ccb3bf19e7b945894e1dafef5335c4716791f641d606d8f6d79f53626
font_02_sfnt_off00014d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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