Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd53d5825966836e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-22 12:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9e474f349c66c238ce91ae4a4e2208cc SHA-1: 61eb78af8047c4997c910d0725d013990329d69b SHA-256: fd53d5825966836eb76ef6557c877d07f588ca8d71def4e1774c5f71bc433c37
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting domains, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://crewmak.ru/uplcv?utm_term=mxl+tv+apk+para+tv+box PDF link annotation
    • http://daindnc.com/fckeditor/userfiles/file/dolifukatuteturetisuxis.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/14527545118.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/wipirumafuboribowekakovus.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/wowusozebipomuka.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/75422921032.pdfIn PDF document text
    • http://akiisushi.com/uploads/files/22172838622.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/31962357344.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/f65d4891d866d5554484d513f7524bfd/ginudusa.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614297854ccc4---gesirasinefo.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210905_7B80976A5CEA33E4.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614250b30bd50---96711782453.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/xulaja.pdfIn PDF document text
    • https://patc.fr/imagesfile/30825278863.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/62ef61a998b4e4550e98996c590ede19/konuvudijejemesorobufaxi.pdfIn PDF document text
    • https://topupdana.com/contents/files/20615893300.pdfIn PDF document text
    • http://beming.com/ressource/site-image/files/kakoporofafem.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/35569846839.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/luvamikoranutajomo.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/tanefujosofetoxubumapo.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fekulu.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/wesutajiwulero.pdfIn PDF document text
    • http://temdientu.vn/images/ckeditor/files/27453796766.pdfIn PDF document text
    • https://iwistw.com/upload/files/sezekedovo.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/49286122610.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/rajafavatazeji.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/zofimosesulad.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_off0000e017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE017 18696 bytes
SHA-256: 8885d8d6da83674fcb39cc319cd32675da39ad4b1672838fe70218693614803c
font_01_sfnt_off00011060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11060 10140 bytes
SHA-256: ec67acd909897f1a4e76d1e9a2b2738f768439382c08f4d67d74990152350016
font_02_sfnt_off000126fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1