Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b710d00ea8cebe1…

MALICIOUS

PDF

76.1 KB Created: 2021-07-01 00:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1150b73b8043c8a476b3f6e901fa0913 SHA-1: 627debc1f84a7ec7ed081e0ed8a33779ec7e0331 SHA-256: 5b710d00ea8cebe1dc6d9a7014447a9a7ce005cbc603500d72a4571f90bcfe2e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected by ClamAV as Pdf.Phishing.Trojan. It contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. Additionally, it features a link farm pointing to compromised WordPress upload directories, suggesting an attempt to host or distribute further malicious content. The presence of both embedded scripts and suspicious URLs indicates a multi-stage attack, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/07a38fdbab4511fc440b467256d6c11b/sonokal.pdf In PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/i8f197rvcdildnulnc0d06d2i2/53722075407.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/sekaj.pdfIn PDF document text
    • http://bulmarconsult.com/files/tilozibojarox.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/b3c0390047588bc1a70ee5b1328b09c8/47086127380.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/xadewazuwazawavosukaje.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/49993158561.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/20340506264.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160947969684b9---zamomozigewukabisawaravej.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/maxevorutubijujaviwosine.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/58489774486.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/lotrebtf3fme6pj8atcft218q7/gusepakezo.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0eafd610bb584d78633f0af76b65defc/30044210782.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e5cdaa0bf---44393865790.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/savotu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/592a17b0643b328aa97470e6e325f5dd/vedojapinojivezexofetix.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/ca7330658676b0073ef7172bf86e52b6/nowot.pdfIn PDF document text
    • http://yilip.net/userData/board/file/28419282562.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/09721f31598b6804c1af5b1eb3dc768b/xonevujedin.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ocdrd6fc9t6igt6k31pah9gho9/71958253231.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/3741661704.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/311b64a9322bf6efa060fad2e5993992/27184434236.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/d5a32a7d56303678ce54436d83f0d47f/zanupuda.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/22629820796.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/gnrv2et0onqnk6ffd8i37fl443/56858763917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how%27s+your+study+going+on+answerPDF 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_off0000c6b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 16748 bytes
SHA-256: 29ec5bd97a5b9abf5facf7606627335e7d400aed022acfdc88a07601e42eb2c7
font_02_sfnt_off00010a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A04 10700 bytes
SHA-256: 605a2767df460045891a44a78b4c368b3c41ccc707c7d8f042254898cef9a85a