Malicious PDF — malware analysis report

Static analysis result for SHA-256 2294f453d3d4e6d9…

MALICIOUS

PDF

85.3 KB Created: 2021-09-16 20:35:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 55a1743d238faa5a72750e579791c1ed SHA-1: 471fe7cffa18f90f2368bc6eb281331357f0b9ee SHA-256: 2294f453d3d4e6d9d12f878b3996e3eab2b3b0e45911cc78b7d06c60fa54910e
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://dautuck.com/uploads/userfiles/file/mifebep.pdf In PDF document text
    • http://rigdrilling.org/userfiles/file/golowudebunoxaj.pdfIn PDF document text
    • http://www.plain-pied.com/editeur/ckfinder/userfiles/files/xosutuk.pdfIn PDF document text
    • http://handgun.ee/media/file/ligezizavuxekar.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/91728378209.pdfIn PDF document text
    • http://vertex-decor.com/userfiles/file/97208339727.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/4c2b8bff3ad4c05ae1dfeb1623b31a0d/nixuxivesive.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/64386673719.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/xadosolidok.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/movegelewuvezilusitepob.pdfIn PDF document text
    • http://transportdiverse.com/uploads/files/54370782099.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/6980466301.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/95990128151.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/devadefogadasigetaso.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/fukipikeno.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16143434d1e9e2---zovadawigokekis.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/rovegikajezaginawuguga.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/relumeridig.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161311d5f3166b---wakekanurovafav.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210905_205548.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/84520744633.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/diziminufi.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16139a44b2802d---dufegimu.pdfIn PDF document text
    • https://pemaboutiquehotel.com/assets/userfiles/files/58150248647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+can+i+watch+the+fight+on+tonightPDF 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_off0000e6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0F 10380 bytes
SHA-256: f86d764d89643b40814e9e8ff5096c670f899d5ae20463f3972c53a981f2285a
font_02_sfnt_off00011690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11690 18428 bytes
SHA-256: f592fc4c1a77e8ec670e601c03caa48ac41f306bf46c90bed964c6db279b2e0c

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