Malicious PDF — malware analysis report

Static analysis result for SHA-256 f641fbf730db8fe6…

MALICIOUS

PDF

73.0 KB Created: 2021-09-01 22:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06ec427fb65962e7b72cf261f2a19f12 SHA-1: c3caa706f3294bdca69e8932bc5abae76aabdfc7 SHA-256: f641fbf730db8fe66e25f8aa93b81d45843073d80d3da94b2d0c97c5d81b9bdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting or potentially compromised sites, suggesting an attempt to distribute phishing content or further malware stages. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://yetisirkaucuk.com/firma/files/sawikasinivobumid.pdf In PDF document text
    • http://sola-brothers.com/userfiles/file/99161490378.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/xelulorepime.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/60012222941.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/milifosobi.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/86986447494.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e783605d61a---kakegelerofej.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/tajuzi.pdfIn PDF document text
    • http://wmhsclassof1977.com/clients/34196/File/xavudubazexezotamadu.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085eeef620b1---wanazulunabizap.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/60306295260.pdfIn PDF document text
    • http://to-kajihan.net/js/upload/files/gilibiwuxuluxav.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/tilidivekajojajuzot.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/lidosifo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c1225f5de8f---setoliz.pdfIn PDF document text
    • https://autopsrus.com/ckfinder/userfiles/files/74749432555.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/91514492437.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/voditazelez.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb2e214a47---zowoful.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/xanobiditabubu.pdfIn PDF document text
    • http://thomas-zigon.de/images/file/19084841096.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609987656d818---tizabijofozumoluxuz.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/rimejivovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=rough+and+smooth+endoplasmicPDF link annotation
    • 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_off0000bded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDED 11008 bytes
SHA-256: 74ab0a2a85e42ccca57a65fe5f6b217b38c16b03282d5b669a0dc96137ce55ca
font_01_sfnt_off0000d71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71B 15508 bytes
SHA-256: f4d273335f68d471b3b2055ce9d3e897222bca556969c43b72657ed473aed46c
font_02_sfnt_off0000fe12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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