Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cbff4e54b60647…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 19:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78356c28734a60942990045da3ab2a95 SHA-1: 8fa294e4f5bd3a722cc89d3f43eb406af3b5e03b SHA-256: 66cbff4e54b606471d40189fa7c0a1498e7149a6653cd4f89aa1ae34e8d1c77f
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to potentially malicious or phishing sites, rather than delivering a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://ontech.vn/images/ckeditor/files/filisofexofosowolorox.pdf In PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/1809565594.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/29649222905.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/jirakatewugapu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/88a375f09180f7a25505c5422a02ddfb/69118352817.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/dexuzad.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/sarirelijegomofijides.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/dalekafidiki.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/nalezifuzi.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/ad4205aa64a99307f379efd2c5ab4511/14362659960.pdfIn PDF document text
    • http://mextro.de/upload/files/zomuzozugigopiwupitol.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/91165520996.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/67217885643.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ae732ed8879---rovuvagobubosu.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/57144306133.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/29314256236.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e21b949fd73---31349024308.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/075b60cc6aa631069e7c973081033bc6/91047472400.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/jp7mavfdjk80mfj2ala47vndnk/rawagapexatoniru.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/paxexegejolafuzonomumelip.pdfIn PDF document text
    • http://nomaquito-travel.com/editor-images/miwanimanumixi.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/80d78a079b04e39cd0b52c2e6472d6a8/nojemujaborezesomadipasor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=half+blood+prince+advanced+potion+making+book+pdfPDF 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_off0000d7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B0 16904 bytes
SHA-256: 2a0cdc6e31882a34fc864ba29293756f1c4837fdddc97334ca3f23736c5fd060
font_01_sfnt_off00010366.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10366 11084 bytes
SHA-256: 37a824b9b8c6461e2c3c08e79a8b2910dcf41d785c21537451b921ac71388571
font_02_sfnt_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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