Malicious PDF — malware analysis report

Static analysis result for SHA-256 e587ef4367b026cb…

MALICIOUS

PDF

79.1 KB Created: 2021-09-16 07:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9c9fed1da500d9b24b0266d1c17b39ea SHA-1: 083dab0fc83dc43f72a6ebf6a541c34ef1a0f62d SHA-256: e587ef4367b026cb7fa0023ac468d9a566bbac4e89f05c394d79214ba7168b88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://chcial.ru/uplcv?utm_term=what+phone+is+compatible+with+fortnite PDF link annotation
    • https://komunalno.vrgorac.hr/files/33412783570.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/walapifawulepalinu.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/23088372154.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/78573030748.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/55809712317.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16130c8e0dea19---34449835751.pdfIn PDF document text
    • http://hzqzg.com/d/files/70044356778.pdfIn PDF document text
    • http://rooptex.com/uploads/2705731897.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/kamiveribakoju.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614262d98354f---61824515229.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/58202186047.pdfIn PDF document text
    • http://trubaopt.ru/content/file/55708480974.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/ceef009a5943ff2064f6a61e770cdd73/dorakuvusu.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/motuwe.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/bigik.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210910070352_bzmnrz.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/3814211904.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/derijarisatuzunimawoj.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/noxaxen.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc93af580---susalelid.pdfIn PDF document text
    • https://tele-video.ru/upload/files/gituvobopamikujifoxonom.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/29555475455.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/vapopesogujib.pdfIn PDF document text
    • http://mebelhotel.ru/images/news/file/gupakasoxoxabazafefunade.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7217dc726---99776010587.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_off0000d012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD012 17836 bytes
SHA-256: 33426bb6596aad7712d637131e5657357dc04b31a50d368805cee1c042eaceaa
font_01_sfnt_off0000fdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDBE 10964 bytes
SHA-256: f42745f934a0606c55cc121fe0b4ed0cef93b10163cfe5284e3574f0388af859
font_02_sfnt_off000116d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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