Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4e0ece8f1a21f4…

MALICIOUS

PDF

79.5 KB Created: 2021-09-12 06:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a695fddc82d586a2bd67b99db1765d57 SHA-1: e7f8132b5be5bbf22a916230f8cb284e5950ae3c SHA-256: ae4e0ece8f1a21f4287f1ff75204f204886a04d87ea9ebf5156472491504bfe7
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or link farms. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to exploit users or deliver further malware. The presence of multiple compromised CMS upload links suggests a tactic to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • 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://smidgel.ru/uplcv?utm_term=ramp+car+stunts+car+simulator+car+racing+car+games PDF link annotation
    • https://aep-tc.com/cache/fck_files/file/30746481432.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/81854206548.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/65212666834.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/zumemogivixutijamu.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210903123556.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/59098029993.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/dupapive.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/78959457145.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/domuwovubuduvovafuzewo.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/70948512156.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090607212273499.pdfIn PDF document text
    • https://digireg.gr/upload/xegexef.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/98557740024.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f73229dad---pijutuxade.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/jevubukevulobisuto.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/11704555133.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/xikizutekore.pdfIn PDF document text
    • http://banquat.com/userfiles/files/87893885660.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/ripatesabunawavupoz.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16133635f7eb3c---kokalukurema.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/31867420308.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/92288350961.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/71067884941.pdfIn PDF document text
    • https://mitrasuksesku.com/userfiles/file/lopiborin.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab19d97790---kuzapilowonux.pdfIn PDF document text
    • http://svx.su/ffile/file/luvekag.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_off0000d109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD109 10860 bytes
SHA-256: 7784d05c47e1333aab695cb3653e3777231af68bf6e6d4f9bd4fd1ce372ae633
font_01_sfnt_off0000ea26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA26 17644 bytes
SHA-256: bbc66361fff59df8b6ebe5110d7a7c241fc37f5a6f1d676775ad39f259eed057
font_02_sfnt_off000117ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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