Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfee5826a00de0c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-21 08:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5995c21d747931851ea1f2d8d922e582 SHA-1: 5446e7cedb4a6a4e9e5211da0ea0baf7843396d8 SHA-256: 5dfee5826a00de0c737d57110ded3bf600b5ae414b9e166da892330ffce24b06
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by multiple heuristics and ClamAV, indicating it's a phishing or trojan delivery mechanism. The 'PDF_IMAGE_LURE' heuristic suggests it presents as an image to hide a clickable link, likely leading to a malicious site or payload download. The numerous embedded URLs pointing to compromised CMS uploads and disposable hosting reinforce this, suggesting a link farm designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gtnet-engine.com/ckfinder/userfiles/files/72840005817.pdf In PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/kopejiwid.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614932bb4ad74---kejejuxokagebarak.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/75bhj5t27rc3mcjsu6hdnidecd/dijugufogokopatine.pdfIn PDF document text
    • https://misbahelmudii.org/ckfinder/userfiles/files/66272738719.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/30162072845.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/tukudelutawibozuvumo.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/87535594575.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/27685474063.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/87794219562.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/10197594231.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/18405756780.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/danoxoxigidinazumalaji.pdfIn PDF document text
    • http://masonhn.com/d/files/kizofofi.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/2219366475.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/zategebawufonavapi.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/29750363102.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/59412305976.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/virejoto.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/26512197365.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014f02eae6---3460259734.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/sumupujejamemodugefazoli.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/21671539448.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/kexidugedobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+download+pes+2013+on+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_off0000b272.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB272 14060 bytes
SHA-256: 1d808fd1bf0802e67b7babec211d33dd75cc2be90553f8aff4b862f46b459524
font_01_sfnt_off0000d575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD575 10928 bytes
SHA-256: d1cedd466e02944b5fd6a2fb71fdfc3565962e6207df5e65560b231edec7f15d
font_02_sfnt_off0000ef04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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