Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b6212ba0090bfb…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 10:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 258eaf7b4dec52414e948b32c0e409f2 SHA-1: 3b31bc3d24ebe9a53b2076d5803f568486447ca9 SHA-256: 73b6212ba0090bfbffa5ed2e01c63ba73fd2f93375030dfb694db58981b8a72f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains an embedded JavaScript stream and a link farm pointing to multiple compromised or disposable domains, likely intended to redirect users to malicious content. The presence of JavaScript suggests an attempt to execute malicious code or further exploit the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://holocaustresearch.pl/nowy/photo/file/tavosexujirobu.pdf In PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/94768943343.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/11378219248.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/81717503977.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/303655acae0e75685669c5829d21287c/99253987729.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a2c3b5a50---14417961864.pdfIn PDF document text
    • https://evpersoneli.net/ev-personeli/file/91572155049.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c561bd087d---91551313123.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ff4147361d9---jiwupek.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/716589peoiqke1acrdr9ni6h30/rowot.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/14749640903.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/342247e75a1777eb08a8fa1f4d489408/wufanoloj.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a84048417---xezages.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/53531436537.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/161263da9323e5---kekexorakuwulivigesoke.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b135737d699---dikerer.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/75814544771.pdfIn PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/totivawemirebo.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/lapigokanilixizivel.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/zuxibuvavozamad.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7565ba4a43---dujugamopoxapomewe.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d23ea9816---bidojirusi.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/lisakajamumarovazaxesis.pdfIn PDF document text
    • https://sce.tw/uploads/files/60e2a074745f1.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608185a058022---74075489385.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=some+people+quotesPDF 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_off0000d3b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 17612 bytes
SHA-256: 0dd73d2970c9335e50c39ac2ff67d8023f5c93dc7ecf018abd41d365330c9eec
font_02_sfnt_off0001190d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1190D 10276 bytes
SHA-256: 03b69381465b0b46bc56453a2d2c942bae6f62e791bc203808b970b22d8aac87

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