Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c5907f15bbc4a4…

MALICIOUS

PDF

74.6 KB Created: 2021-09-17 13:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 19f2b78329797b544ee5fcc8689be0a1 SHA-1: c4d16bb06e1a726d50a1ccf580be95acbdf24732 SHA-256: 40c5907f15bbc4a4e6ae83cc9df2bbcb4ab9cd654c1c0a69e896af15f0c60a29
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised websites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, potentially leading to further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://ketchas.ru/uplcv?utm_term=fastest+drag+car+in+need+for+speed+heat PDF link annotation
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/22694474125.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/xenijarix.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/senusubijaxunogorenegekis.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/36421390514.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///fabipuwuboda.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/65259348506.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161374f112b215---peworewajipuzavi.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109100054036092.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/83695745246.pdfIn PDF document text
    • http://isotope3.pm-ural.com/uploads/files/10809501472.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/8b081a363895e08e9b0fd6135bdb5888/24243209577.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/batotijesibidepumaxuwa.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/36807751914.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/61495654356.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/78232513586.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/11191881327.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/dedidozexuz.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/93054420152.pdfIn PDF document text
    • https://diphong.com/uploads/17635505185.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/gokiwimunixes.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/um0pqufn328ejvjh4s9tr9lv7u/texexigol.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16135f3d607f97---35660767956.pdfIn PDF document text
    • https://vibangthuaphatlai.net/uploads/files/74858822180.pdfIn PDF document text
    • https://dijitalsanat.link/upload/files/73744606877.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/2303531759.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_off0000be5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5F 17472 bytes
SHA-256: 5655d41059609df617894540368a87570179251f3c5bfcdd86fdb125d6465c7e
font_01_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 10828 bytes
SHA-256: d4698aa6f22e0eeb526b951e791d9df901baa9ff09c8f744409f45aa54c87acf
font_02_sfnt_off00010403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10403 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1