Malicious PDF — malware analysis report

Static analysis result for SHA-256 0772b663a58ed6d6…

MALICIOUS

PDF

67.5 KB Created: 2021-09-19 08:16:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 59500a0cb3510708ef20b081e3514efb SHA-1: e716f24ba253be434fb8ac3190e61f48b7b5b543 SHA-256: 0772b663a58ed6d6d83045ff7ee761a14c406e35db129c4d4322ed93bb3bea8c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is identified as an image-only lure, typical of phishing campaigns, containing numerous links to external sites hosted on compromised WordPress installations and disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious content or facilitate further compromise. No scripts were extracted, but the presence of embedded URIs suggests the primary attack vector is user interaction with these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 67 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 http://goldsunjsc.com/upload/files/16840295957.pdf In PDF document text
    • http://kubablimel.pl/Image/files/88320679135.pdfIn PDF document text
    • http://zenithmetals.com/files/94737561089.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c63ba2315d---28011341232.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/65917162581.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/31891082466.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/lekipovamasazix.pdfIn PDF document text
    • http://navrattan.co/userfiles/file/jedafemutoweke.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/74432334281.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/tovomemexatedanonefitakal.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/18509438722.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/98498996898.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/38805210582.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/10016622419.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/memite.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d182a7b080---22318409819.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/59209587519.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/duseka.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613734f3be731---83992930356.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/55491961358.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/gekitozeduvavijeraza.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/18317156924.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=firestick+connect+to+phonePDF link annotation
    • https://mediaget.com/userfiles/files/64230158532.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210907/16309843781178.pdfIn PDF document text
    • 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_off0000aefb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEFB 10332 bytes
SHA-256: e8898518a0f5e6fdad05626d4337b5b98a73f01dd3203bf64192b41f4539dd08
font_01_sfnt_off0000c638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 13956 bytes
SHA-256: b2d720c3a7e1b403e98107db45519ca5f3abbd8ac89a6f951471a32deb103883
font_02_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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