Malicious PDF — malware analysis report

Static analysis result for SHA-256 c323ab8d22a3ed2b…

MALICIOUS

PDF

109.6 KB Created: 2021-08-23 15:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9fcaa7a9eeff5cf8cf56b13b7a4f9c9f SHA-1: f8b30049a7666d93bbc29ab1815dfc9a834961a0 SHA-256: c323ab8d22a3ed2b80ce44854b47eff3a6266969ed4741ab06c896ad83b1079d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also functions as a link farm, pointing to numerous URLs hosted on potentially compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9899

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 http://arqing.es/ckfinder/userfiles/files/79761220144.pdf In PDF document text
    • http://amphorabeautyclub.com/campannas/file/boxidot.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a92df14cde6---foragoje.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/78915057068.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfda1cafca---46471247979.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/wewexunib.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021070400413373499.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/6f2616644dab0bce766ac9965191e9f3/zadabixetojorama.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/22646904470.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/690bc4dc30682728c8d3324d962f3a61/31427530358.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/1fefd3e4244d093353e9c714f203d4c7/nekizizazunawikumeso.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092bfeba21e5---kugimitixojeb.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210618_4237E03D1370C1FB.pdfIn PDF document text
    • http://goldmustang.com/files/files/59739544636.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bae2b5d5d---67093120680.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/75035307328.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a40d7b02d06---tojiwazuwexidulodudotabop.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160829be0e11b7---refigetexotulodelu.pdfIn PDF document text
    • http://prabashproperties.com/ckfinder/userfiles/files/lesaxilipalubakugafisedod.pdfIn PDF document text
    • http://nhaphangmy.us/upload/files/3000849680.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/polef.pdfIn PDF document text
    • http://allycatering.com/userfiles/bizaniledixubisanubafex.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/10262747524.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/10246133658.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=molality+of+a+solution+definitionPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000145f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145F3 19208 bytes
SHA-256: 4b85052cbe8bdb1573f63faac5c0a027abd3d9cc27588cc085ddc45c64461251
font_02_sfnt_off0001797a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797A 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off00018eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB0 10452 bytes
SHA-256: 81d405bd3bbf17e047c8b192e7d0536b23886020d39750f6ac70e63221072187

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