Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f2cb663afd39ed5…

MALICIOUS

PDF

78.5 KB Created: 2021-09-13 01:21:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1e8bacef4ac43b80c1b746ff51d3c64e SHA-1: b5e9ad208a8d019fdb69e7735f6b6f1086edee6c SHA-256: 3f2cb663afd39ed5301a9a4b3cd4f3f19eab5f4f195a3dddbc149bf65111f048
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=vertigo+lasting+days PDF link annotation
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/904c063e93d9104db6208bc9d87cf04e/97807575764.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/85240822167.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/11758562239.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/navatiledetosopere.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/warojower.pdfIn PDF document text
    • http://dytac.hk/userfiles/dulisekewav.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132455e1d849---xezidenabebunedogex.pdfIn PDF document text
    • https://peiitw.com/Upload/ckeditor/files/zapezevefuvujutim.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/lezolewademopejebawutazo.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/tesofamibunazevavowoj.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/sideriras.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/runuxemu.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/59688047328.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/detor.pdfIn PDF document text
    • https://ekransamara.ru/files/22018779232.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/7c3c6a0ce6f4bf3678bcce7e7d4484a2/firulisopunovigibagukobis.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/34695652288.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/juvevufupajojezazu.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/63749721750.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/75187915696.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/35167778766.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/93122718599.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/sifurodiworipej.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/vudosado.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_off0000d106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 17028 bytes
SHA-256: ad80310c64e4e02d5c215a694a222713b7d32a88474f1c8252b25d4daae07895
font_02_sfnt_off000114e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114E7 10504 bytes
SHA-256: 8b43cd02e2e8f2eaca5fa259048e85b670a57349099fd5cefe29c7f6381b659e