Malicious PDF — malware analysis report

Static analysis result for SHA-256 45bf1507cd338ffe…

MALICIOUS

PDF

99.6 KB Created: 2021-07-21 14:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfce143a838330a0b30873f7318e06ad SHA-1: 99f29b4b4ab930a124b73632741c20160310e923 SHA-256: 45bf1507cd338ffefe1a7cb860912fe7f095a0218f8158931fae7b7794bbd1dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress upload directories, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The presence of multiple links on disposable or compromised hosting reinforces the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160b0cfa954de3---rosesofogipinex.pdf In PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce08bad258980904d923e898fb279200/71107891217.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/zupogotesuzaj.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/eda4a86544f89fbdb350137f1907c5c7/62356402553.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/300785ea16f52ceda4b3a5db8ccf750a/zomadafidedinezepawud.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mkg71i62avj4ff199djr16o391/larunixudosexirusirepix.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/nopenivox.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/xizesekibufafu.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/ligivuxobadutijubupegev.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/xufovozavidutepemafesiki.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/66949077805.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/ziwesujavinetil.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/d3204713e43fea203020fcdd7c464598/bexetezug.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc373e64686---62234994970.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160867ff991fd3---95493430114.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/suzedegotafogijafamu.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf601f24832---44256165042.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/b343291166908fbc146553a7b40060fd/68925416740.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/velinilajixaneba.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a648988dbe8---86706452918.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/7e2nannjukq1t8cdmsntccteq1/tufogiw.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c0069ff47---67743012703.pdfIn PDF document text
    • http://adveotec.com/img/file/63648524421.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/31104898910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=black+and+white+pit+mixPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c66372c596432aa4e86166eef73b3539/putujeke.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_off00012212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12212 10724 bytes
SHA-256: c638437614eb52f7f92c4e1c62ca0e624a09753e0e9c4bb6e62e8cac83397c68
font_01_sfnt_off00013a91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000152a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A3 16692 bytes
SHA-256: dd74b5dae4be06069d8d2d9b5d808138126392aead9cf4ca060fc667deb6274c