Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a540bda4b268c4c…

MALICIOUS

PDF

88.9 KB Created: 2021-09-21 00:16:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2fc34cd87c271b8dc113ce30ffbd382a SHA-1: a752b38d63e6600f0e81957dde31bde6354adb5f SHA-256: 6a540bda4b268c4ca18119d54e135e0163a4050d642582de83c8f7f3608f9299
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm with numerous external URIs, many hosted on potentially compromised or disposable domains. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://synerhu.ru/uplcv?utm_term=mmorpg+ios+2021 PDF link annotation
    • http://gerocuki.hu/user/file/54473410768.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4e0abdc6a---fukirewedemezejupib.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/rutabe.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/86443956474.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144430a4ad25---purinepadixu.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210918_561476A848D0AB65.pdfIn PDF document text
    • http://abakus-routing.co.uk/ckfinder/userfiles/files/liseka.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/36344750711.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/duzivuvi.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/45271070246.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/kinenunoferu.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5b38a57d---83411809557.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/75141807682.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f79d8e2a1d---sojebagalasomaxuxavov.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/69962619798.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/soturebokulajoninape.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/gilawimidadubi.pdfIn PDF document text
    • https://cosplay-expo.it/ckfinder/userfiles/files/zaxixotizidabupajakodo.pdfIn PDF document text
    • http://ydis.kr/userfiles/file/191101333322.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021091622174073499.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/ziwisudogefewurotuxexujaw.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1630623819.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/dff8c035f21063b2a25622ec6760563b/31343250610.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_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 10340 bytes
SHA-256: 4c7f09166515e079ce000a8ba399c71cbc6a1eeaa9a6b46d15e52ecad7b7614d
font_01_sfnt_off000110e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E7 17884 bytes
SHA-256: b4b84b4f2eb13f059b6a6705804b583acb6bf7d5ab8d3080332cc3658fd5eb9a
font_02_sfnt_off00013ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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