Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b9b9f78505e6bef…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 11:11:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 938775b97f9cb5e18598964a6d34bdc6 SHA-1: a533f9c0ae544bb98b13de5013e3df0765cdc749 SHA-256: 1b9b9f78505e6bef5eb91d2519914333c5a6716c7e09b985467f6ef575c9357e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many pointing to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nomylo.ru/uplcv?utm_term=sony+xperia+m+android+update PDF link annotation
    • http://domuran.pl/files/file/53383774692.pdfIn PDF document text
    • http://podushka.by/files/files/musoxowubizajixa.pdfIn PDF document text
    • http://www.jysunshine-hotel.com/up_files/file/21063738516.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/gurowalapazijaginas.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/xepewuvagisufug.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/4692712267.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413c690172b---65023191734.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c039d0c04c---35280223775.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/14014388342.pdfIn PDF document text
    • http://www.moyekolodin.com/files/nagaviv.pdfIn PDF document text
    • http://www.heksan.com.pl/file/gedunexidetafowel.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/32127759232.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/98986555876.pdfIn PDF document text
    • http://maraulsan.com/ckfinder/userfiles/files/47466133798.pdfIn PDF document text
    • https://frutalmente.pt/site/upload/file/zimonido.pdfIn PDF document text
    • https://transturist.ba/ckeditor/ckfinder/files/files/soviwu.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/gokapedawade.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/kolulakonewuzujiteno.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/88069036250.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/gekajukapi.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/lidumefuzanowurudi.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/73399043375.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/62896322721.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3dff48b05---54007076223.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/mijegafumijupa.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/jopurimowaxeralu.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_off0000b967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17E 10732 bytes
SHA-256: 7c1e1678b683d28a01903af34b01591f0d932c59d5540b689325833c424b8f98
font_02_sfnt_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 16596 bytes
SHA-256: 6fd6b16aa8c27b5bff7943048837af068a2ba4de5890a53e44ddbd8046089c0e

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