Malicious PDF — malware analysis report

Static analysis result for SHA-256 421f6759c4fc2be1…

MALICIOUS

PDF

86.3 KB Created: 2021-07-31 09:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11656268130152a015e4596643e29839 SHA-1: ee0d539a953471e35ff6cd9968b289a40bfaeb8a SHA-256: 421f6759c4fc2be1cf53a7c637a582975a80da79266ba064bc5a54a1e6923977
156 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous embedded URLs that point to various websites, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external, potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/56fe1fb01aff3c91423854975806de92/91353720208.pdf In PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/85d29541bee07a3bd55a0ed03cd5cf67/xevukigofililemotakep.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/tukuwekodipofurisivafaji.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/23cf4325fa7d99f6c074705cd1832200/5894043665.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/15335849503.pdfIn PDF document text
    • http://playeasypiano.com/resources/fck_images/voduxamokaduxipexef.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/fijik.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/wejusunulod.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/51781216056.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/roribitafobedovopopikisad.pdfIn PDF document text
    • https://pindimana.in/uploads/file/fajuninejezejulaxaluje.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/ctqi8jn6hd9v1bunpg2eqmf801/nusipozejewededuwigab.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/41891529097.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/vugimazikokisemem.pdfIn PDF document text
    • http://ave-france.com/pics/files/kijori.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/dabedom.pdfIn PDF document text
    • http://techsystem.gr/data/uploads/ckeditor/files/66336335296.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/bab8a235fef33467c0d67f4a4ce8efe6/58169915276.pdfIn PDF document text
    • https://asiajitu.com/contents//files/sosabijavuvone.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607187ae9e569---77029410764.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609847ec6b16b---74247633683.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/gadexinatojitorakorag.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/97336757315.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=gta+4+product+key+and+unlock+codePDF 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_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 17016 bytes
SHA-256: 86ee40fbc55c97755fc05b3e159334966cea239de98a2ccaacc7dc8cc4adfa86
font_01_sfnt_off00011a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A84 10668 bytes
SHA-256: e5deb87c395b477e8806e071c4aaeea481bfedf4bb46d580f694922e7b2709f0
font_02_sfnt_off00013329.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13329 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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