Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe0ce1f1a9fd8b0…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 23:47:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f83e7fe57615c9644d715ff39101c22 SHA-1: ee2e19177bf8fc64854239177385b05b3f7133cf SHA-256: 9fe0ce1f1a9fd8b011c1246d1d28bd699e884fce1d988f5f073a3c395d3a9f3c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains embedded JavaScript, which is often used to execute malicious actions or redirect users. The PDF also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to distribute malicious content or phish for information.

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://codecs.ro/images/file/benubap.pdf In PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/91123100726.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/31937359747.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/17016598763.pdfIn PDF document text
    • http://ktcyy.com/ckfinder/userfiles/files/gemawininabovemulavokefum.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/14201719564.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/nemevojumiw.pdfIn PDF document text
    • https://majubesar.com/contents/files/wunokajurujovafojakom.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/vonazawalakonafabozeluku.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/16136946857c50---lavumodosatuxesazaj.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/dugisap.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/vawuxezuvovalulobefipelex.pdfIn PDF document text
    • http://pactolous.hu/upload/file/jazudevekixavexuposibal.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/regutumugatekotixuxizude.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/nikasol.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/57710454014.pdfIn PDF document text
    • http://artsar.pl/userfiles/file/lofedemutodeg.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/99818295384.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/53143518684.pdfIn PDF document text
    • https://vcubusinesssolutions.com/userfiles/file/lalovusate.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16138599f670f9---77580059321.pdfIn PDF document text
    • http://sake-tori.com/images/library/File/76210424736.pdfIn PDF document text
    • http://ecme.site/2015/vat/upload/files/5503119529.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/64cc9c47e1edca3585743a97504c7ed5/fapovujetaz.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/97bq95f210gn7cghp68fk6era3/41652212901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=national+weather+service+app+for+androidPDF 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_off0000db4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4D 17264 bytes
SHA-256: 1a6cef58ba6ed7c0c22eaca5b4dbf82136a01208eb3abd4debbc213c84f8d7ac
font_01_sfnt_off000107ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC3 10844 bytes
SHA-256: 884b6a66fd86c031e7e150af0b41e78df0a4d167a9510d25de4f2fb732fe5d59

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