Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15b8a44068c3c55…

MALICIOUS

PDF

97.1 KB Created: 2021-08-31 22:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0f272a664f73277ad710298b768052de SHA-1: 88ef74798bb5706ba4670f46ca0d6a0c24c57778 SHA-256: b15b8a44068c3c55698f3f4982705704a429800451768e7fcfa97f0f331776e4
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. It also features a link farm pointing to numerous URLs, many hosted on compromised or disposable domains, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://huiking.cn/uploads/file/121308037764.pdf In PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/50934699297.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e46e38ca17---9435549716.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/07188c2cc21b3c17734df1032d8a5762/mutibetoto.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/74025416967.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/lugomosolobifiset.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5527b01c81---wipelew.pdfIn PDF document text
    • https://avgdesign.com/userfiles/file/satoronex.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/8af50ee476b85a1c7753365a520ddac4/jitijelijufixa.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2a2f9afda652d55bdc7baaa6914abe81/23713749198.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/panusemobupubodexi.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48d989cbaf---82839042920.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/lexakewoka.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///petagesumasaxawolep.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/3au6p0lv3budv9hrrktqrt8rv1/45101057320.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/73238638346.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/20753846110.pdfIn PDF document text
    • http://pk.mo/userfiles/file/78001231512.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/xomurazedixureruno.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/werizenutigixomul.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/tamefunol.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/liwofexewutediramadefep.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/258b9ed2a1cb8a5c8b76e97c8fa06f71/3100746758.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/wonifewejagobixara.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0870f3826---85099197897.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kloo77h3j55c76qfc9sfldtivf/latokemadapulipevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=degree+days+for+freePDF 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_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA6 17956 bytes
SHA-256: d04e6bc7a9086b3bbe5afa0342f5c6134df9ddc8201eb622e69256ddc5bcfb19
font_02_sfnt_off00015d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D9C 10304 bytes
SHA-256: e0a9939af13a3f0e467ce7ab7f697115032ce3e073ca3c3813e1ac2889628d06

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