Malicious PDF — malware analysis report

Static analysis result for SHA-256 977bffb3a3b1ac5b…

MALICIOUS

PDF

80.2 KB Created: 2021-09-15 09:22:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bf8ebeaec61796bd360eb379bde2df0f SHA-1: 933524f86f99aabd70f9d0d384d15912aee0a2a2 SHA-256: 977bffb3a3b1ac5bfa680acf0b6f5993fcecad8e26c40cc6ed024996fc3fa2e8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/wadopigikozitajusumatoput.pdf In PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/koliti.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/52120363617.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/titazudalofos.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/38838341806.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/fitilakiletujijan.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/dobaribugogukew.pdfIn PDF document text
    • http://thesprotia.gr/uploads/file/16471980229.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/35650802014.pdfIn PDF document text
    • http://zenithmetals.com/files/xesodutakisubij.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/6421201066.pdfIn PDF document text
    • http://praguetransfer.com/files/file/jakepuveg.pdfIn PDF document text
    • http://hiniceshine.com/upload/dozoxitinoza.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/51229191326.pdfIn PDF document text
    • https://mackbeks.com/files/file/semasobetizanorupagojetej.pdfIn PDF document text
    • http://screen.by/images/file/zuxoxetazajogaf.pdfIn PDF document text
    • https://topupdana.com/contents/files/gusop.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/zazag.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161416514be06f---60220001804.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/044f500a4b7b18617685c79edc64a0b2/lesuxev.pdfIn PDF document text
    • https://steammining.com/userfiles/file/78226615407.pdfIn PDF document text
    • http://briztravel.com/upload/files/zumojumopafasinesirix.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109100001246658.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/203346d181ed1401c26477b9ec6c7360/58885917925.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=emoji+iphone+android+apkPDF 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_off0000d852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD852 16708 bytes
SHA-256: 696edd7d09f617cb43bb7a2daf136b220c7c058c8c6eb540e28f5cd59fdb9fa7
font_01_sfnt_off00010377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 10548 bytes
SHA-256: 8097b6a29b95aa481b97b465828632480406830c9d5b3014727a54f866446135

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