Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4c7a39a6bdd1e8…

MALICIOUS

PDF

81.1 KB Created: 2021-09-05 02:05:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a662f4bca553d7e6bc98545b4ee8c324 SHA-1: a444c7366898a17a1b421e0b2dd7b9f586ae8323 SHA-256: 9f4c7a39a6bdd1e8ebda77f234d2b897adcc16312e4456bc11c39be0bcab1d70
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to multiple distinct hosts suggests an attempt to redirect users to malicious content or phishing sites. The primary attack pattern involves leveraging a PDF document as a lure, likely delivered via spearphishing, to trick users into clicking on external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://philabc.ru/uplcv?utm_term=batman+damned+free+pdf PDF link annotation
    • http://giaodantanthaison.com/Images_upload/files/xobovijegemolupu.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9a6b81b6---54051869667.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a97d86348---lifetuku.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae765d0c4---56457845264.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/vegeketol.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/27284593623.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/zekumedifololawuposojol.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/f1bbe463a8a231af9ebeebdcf80089b7/28067806542.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/57124351833.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e6eb2880a---48213615293.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/ca791e332d7add60326a0565a4188460/nodekorixokapafiwumafa.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/87062280957.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/8e4edba6abe7632e374de6a277be0544/15306753644.pdfIn PDF document text
    • http://heatherjansch.com/ckfinder/userfiles/files/32153317338.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a74a9aba1f---17126546485.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/vonoguwirada.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/14127322814.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/6867918989.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/vujixaxiv.pdfIn PDF document text
    • http://transport-vehicules.fr/userfiles/file/befas.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/a7649c01a114d4e1b8e44601ee354fc1/tapirifegafavexi.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_off0000d8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8CD 10288 bytes
SHA-256: e1fd214d317b93ae61602eefbe4843e78534bc6b7998163c8d549bc19c3a1b17
font_01_sfnt_off0000efe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE2 18156 bytes
SHA-256: 8ff859ecd06c384f42c0637f30b329fe9caf42902874557ec658e56e1863b157
font_02_sfnt_off00011f65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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