Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a7aa24ec78037b6…

MALICIOUS

PDF

84.1 KB Created: 2021-07-29 18:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c739a36ccae7442ea3fc5c7c7ef7b029 SHA-1: a2f3efb19c704dfd49ccf0907065cc2de1bc7c7b SHA-256: 5a7aa24ec78037b6b5eb71dddd21032b029ddbf914dbdbd17e975297673515fa
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple disposable hosting domains, suggesting an attempt to distribute malicious content or phish users. The presence of numerous links on compromised WordPress upload directories and disposable hosting indicates a tactic to obscure the true origin and purpose of the links, likely to facilitate the download of further malware or to conduct phishing operations.

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 http://www.siscbolivia.com/admin/uploaded/fck/file/bototugobap.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac4ee4f108---vomukaxazeti.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c139c69e3---dimatabufuxikav.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210611065658_xrd7zr.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609235860f32a---misixutevokezinorusirizuj.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/66021975316.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/ulj39jl5gu7j9uqonh6jnl61mf/7475765124.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f369c766c2---dozabuvakej.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/907c2719f8a561cbf35fdddaec261925/nuvedili.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/remavaxox.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070cb76da67f---89396942927.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/164a7874dda0095ed36210c1bdae3e73/22203994335.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/lakitepoxamadakoregu.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/redarakalarezagaveloni.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/robasaxopidekizevales.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ca0or4npmgirtpjfjdusoedv63/99470357822.pdfIn PDF document text
    • https://stegopackaging.com/wp-content/plugins/super-forms/uploads/php/files/r8sgv0ie6hopi31rr22ct59fbu/56788389975.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b206f15997---kuxomedow.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7ts1l4gi1jib8p02j6eu7el1gi/22697666541.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/koxafoxulosib.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7l70ht1tgglg14bvq7iiu26hl4/zamozom.pdfIn PDF document text
    • http://ambulanceservice.pl/userfiles/file/57781258026.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7e2c36c2---9949574416.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/p4eofeaqoqn5bkopsmetcuik7c/sivotixatovarel.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/rexapexozurovebarigal.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/fakubakuxiwetitigaxegir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=baixar+gta+san+andreas+pc+fraco+gratisPDF 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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f53e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53E 10904 bytes
SHA-256: 644c28b7253ea6d009af58ab801497577c8c9e66d9085fc8c85f77f2c31b538d
font_02_sfnt_off00010e6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6F 20148 bytes
SHA-256: 0b13b4df20b49884fc3ea34016205f5e53e8f519e265048b84692b7ab5cbb6b8