Malicious PDF — malware analysis report

Static analysis result for SHA-256 f17ff1d4399c893b…

MALICIOUS

PDF

108.9 KB Created: 2021-08-22 02:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00e3ac1f42b726b7c184938f50565c1f SHA-1: 257f7bb7fbd8b872a9de48621ba284cfb6f1d68a SHA-256: f17ff1d4399c893b14fa838d5156d464b5c36d0753e5d36018d1d05c777f345e
156 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to facilitate access to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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 https://zlatartopalovic.rs//files/10791009764.pdf In PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1962120639.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/66902469671.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/noman.pdfIn PDF document text
    • http://synfarm.com/upload/files/geruvulemedusopu.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/f50c2a105b73265b499500b6b7514cff/40370517645.pdfIn PDF document text
    • http://gilleyfamilyreunion.com/clients/6/6c/6ce887ac6ce8bbcacf46524318b1f362/File/lewizat.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/bimasatezitif.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/48897630804.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078c80c9a34d---49561963119.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/72c9b922b3c1c57ab853653a5180062b/sokafavagapuritifefuxine.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/30425927060.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6b130bd3f7896ebe8fca9da19db644ad/65619762103.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a25d3a8dcb8---letezisugijawi.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/tegelabexolutukuwefara.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/fupip.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/guwisevigatetezese.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/jibenunuw.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/314ddfb25b609f2c68d4c033a9bfaa44/todusodigojig.pdfIn PDF document text
    • http://firewaterdamagedfw.com/test/fckeditor/uploadfiles/file/tirekiviv.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084ec79c51ad---jedonumivakinifip.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/lidewamojilizun.pdfIn PDF document text
    • http://ski-experience-japan.com/images/blog//file/62181684608.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a706d2d64e9---jovuluzokekejivinibuv.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9375d81c5---62673282903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=telecharger+music+khaliji+mp3+gratuit+2019PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00016076.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16076 23796 bytes
SHA-256: 8c015daa5272f46b1dfce65fb700fc4700ddc03340350000923313a2914c4b03
font_00_sfnt_off00011250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11250 20256 bytes
SHA-256: dd576d4cd16b68c1834afb837174470d9b488e705fa7096aa5f15d0f2309f82b
font_01_sfnt_off00014518.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14518 11516 bytes
SHA-256: 069f59bced71e6b9a15084f882e796cc7522db85f28767bbeb6981741a42d3fa
font_03_sfnt_off00018ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18ADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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