Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9cc3f71f767f247…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 15:20:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 08af26d215798f9c7401a36c730d5b02 SHA-1: 787417e6837b90dfd122c87895b6e43687bf881e SHA-256: d9cc3f71f767f247cce981356cfed0020dd32f595a80d1bf692cda46bb0b1cbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://laborke.ru/uplcv?utm_term=pet+practice+speaking+test+pdf PDF link annotation
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a06361effa3d332f32ac71bb8db10957/xukigorenofuse.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/sanevagezekopalab.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608622ce7fbf7---jusegigupojogikopakewofe.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3af2c04896033b4f98ab05e535c5d814/93746846526.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/zawaleberusu.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/ca9a8472c184b4f6b60877d04359a488/gapewovirudes.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/46401035851.pdfIn PDF document text
    • http://turystyka.powiatlubartowski.pl/admin/ckfinder/userfiles/files/40507282417.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/33944927236.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/5206r5sg36mpeu722f3f4oe604/16679233636.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16071a203e9e0f---funaluzaleza.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/44449366031.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0140esvd7m1nbdh0b95d8mbnk7/41168611229.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e926f18eecc---12073975885.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/davunutaniluvosa.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/92949072103.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/sopovo.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/32974478457.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7500cd75c---17236674023.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tv0a0jef2iv7u3menpe8v6pqg8/vukuretopavugetudo.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/vizevolexigalufi.pdfIn PDF document text
    • http://eptesteplelek.com/uploads/file/27241582834.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/zaluborisesowogamome.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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 18632 bytes
SHA-256: 79347f08acd92de8e18e74b241b2c255aa5815262384caaed9cd7caa0705f59d
font_01_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CC 10724 bytes
SHA-256: fa609b852a2b3ae3e05345e1e36f95e2663c2ad8ab9e4b06ba8eacd9511a71e3

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