Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d04eda75f2eb789…

MALICIOUS

PDF

99.1 KB Created: 2021-09-09 04:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e27ed13cbe45359fac3c5a4f66dfa9a SHA-1: 673876bb331b6adccfec75487d2753465ca48e79 SHA-256: 9d04eda75f2eb789148e419e4454b7ed6139e2e17d8832943fd1e9e0aafd5082
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The embedded URLs and link farm structure indicate a phishing or SEO manipulation attack.

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://studiotecnicoprato.eu/userfiles/files/molukazedekotimuzuluzamu.pdf In PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a9aa872cc---gakojuluturaxajusor.pdfIn PDF document text
    • http://0975811252cool.linker.tw/files/popimibadinirimisalesug.pdfIn PDF document text
    • http://ediliziaunoaventi.com/userfiles/files/matiz.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/43433610040.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/fusonatopomuwuw.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/kojasiduzosibivawewobuwi.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/9637725935.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/51969489941.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/7f73e4ba911a5177b2cdb00a8650c7e6/36282766426.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/jodisarifidox.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/55549584627.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed697bda2---63135286822.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210909075845.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/mamogiteji.pdfIn PDF document text
    • http://jpsacademy.com/slbdavbatala/userfiles/file/bujodazulin.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/56751858252.pdfIn PDF document text
    • https://makenie.com/upload/files/544045080.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fedowipago.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f58021dd41---zamazixotapefubavaxawalij.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/tuzalir.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/47384993071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=can+i+play+devil+may+cry+5+without+playing+the+othersPDF 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_off00011eee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEE 11492 bytes
SHA-256: 169df3ae2cb97bd0d64e7b0f4a91fd1178e27a74c4a61f179727b8371b1123c5
font_01_sfnt_off000139d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151E7 17092 bytes
SHA-256: c6e2c8c3710330e537eef408071f2bf11097b856dfe3e4c1a8741abdfaf167ee

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