Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eb721f468b40829…

MALICIOUS

PDF

80.5 KB Created: 2021-09-01 02:12:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b14e986c3570bd9c2a628f5b22900d0e SHA-1: 69a8e0336531e8f5714b2b9f885a868e42a34ef0 SHA-256: 0eb721f468b40829ad9d15925dab09b006501315f99a4ccdcd6cf3583cbf10e8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tramhuonghanoi.vn/upload/files/fekagabemadolawegizulirow.pdf In PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a497ce78de2---pabinobilofude.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/11110114266.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/i2iorrp89gup267odndhq5d1c0/bikekisisizoxati.pdfIn PDF document text
    • https://kawanmto.net/contents//files/dafudi.pdfIn PDF document text
    • http://damutech.kz/upload/2021/08files/210831084442015753u3kip.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/i89faekckrjm766cnfogfqccns/66443230435.pdfIn PDF document text
    • http://favorit.pl/userfiles/file/lotudilojojapaz.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a19e36ca4---73187747260.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/mevofadugefajotipuzuki.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210705030428.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5f7dcae75c---dufomumo.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/kuwumesisevimixe.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/6f04f25c49f92c721c532b82f4037f1e/89226419387.pdfIn PDF document text
    • https://mojer.bg/files/30927473742.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9ce1a70c---wadiririgobol.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c7aafa5946c---podulejipowakazivejetux.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/5adac4ed27547fa6ae3b2819c7695e41/20353702837.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/sulepefuzoju.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/38140412143.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/35271330753.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/rugurexisiviz.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/bekutujusukir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=route+planning+in+logistics+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_off0000d9b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B4 16356 bytes
SHA-256: 8f0acc5d22a4e6f6799c81217a688eaa8a28c1e9d600a3217d3d575303cd268c
font_01_sfnt_off000103c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 10840 bytes
SHA-256: 41db5862f2ec25846d0f4aea55cd249711825f99353d55cbd3730d3d64884dff
font_02_sfnt_off00011cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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