Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e49ee482b9b0f3a…

MALICIOUS

PDF

93.9 KB Created: 2021-09-15 22:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 844585d6fff032f9b975930d454290fb SHA-1: a40babe76ad8eb67a0b59040ade63cc0ccddbea9 SHA-256: 3e49ee482b9b0f3a5604f235b4a066d864d2c3a3b34b2db67b4e2d7b24eb21c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest the document's purpose is to host a collection of links leading to malicious content. The ML classifier and ClamAV detection further support its malicious nature, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://nexxosrealty.com/userfiles/files/suburuworaweg.pdf In PDF document text
    • http://ip-malkov.ru/uploads/files/vasozupago.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161379944ec8a1---komuxafo.pdfIn PDF document text
    • http://lexxyin.net/files/fckeditor/file/mitari.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/totupalu.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/gigunikelota.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/xugagekikiwopivufe.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/fizegupegelibikexuwituz.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/57127194505.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/47644295027.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/baxedazeritabonas.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/zatisefodudekidoreb.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/37259302623.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/40426378469.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/xamiwofesop.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613739c721926---89926981944.pdfIn PDF document text
    • https://aildf.in/userfiles/file/kisabopavuneda.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/wevopudajoluvuzudaled.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/gapumogivesimajilazosusi.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/timolesujosivofupavure.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/47086759215.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137de1dc428a---41676196303.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/77570866236.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/38183311996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=aplicatie+tv+androidPDF 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_off000106e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E1 10384 bytes
SHA-256: 7c227301c88ec3734574c82d5baee15d962bab44b7da4436be894f86b008a9d7
font_01_sfnt_off00011e81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E81 19908 bytes
SHA-256: ef4fbc4d15f279e7904e7463be09bbd287a3c1bd96ba69b6256c824552436616
font_02_sfnt_off0001520b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1