Malicious PDF — malware analysis report

Static analysis result for SHA-256 983d383ce7652be5…

MALICIOUS

PDF

89.9 KB Created: 2021-09-16 16:07:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 9988a59fab4c53a666cf8cb2bece0701 SHA-1: 45dde726c605ee053f3ccbfe89d666475688e492 SHA-256: 983d383ce7652be5c7adabb2f974ded95e06b05604d2c2f6646001b482066bbd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, characteristic of a link farm used to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://szakkepzosiklos.hu/upload/file/80653318815.pdf In PDF document text
    • https://bunian-co.com/other_files/File/26220055382.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5d0f424f3---wajesalosidelanaxer.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/86383106105.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/jadawixuzus.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/parokexiza.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/94914889278.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/461111772.pdfIn PDF document text
    • http://24cvety.ru/upload/files/sitonif.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/xodeluziwupinoraxusejis.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/gefekojonijotonikulas.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/17996728950.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/jumemusiwuwafekituvifunux.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161339566bb2c4---pemovo.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/29163107678.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/f346ef397c9f8d868894d3c3f6969494/32636976833.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/aa0bfd7ae6c62934ca231e399475c197/sevisezawoxadesa.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/tisati.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/69936345090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=add+cinema+hd+to+firestickPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5C 10768 bytes
SHA-256: 904d682a25a9475dc510aded3cd4d0b2ef649b12e22cf5e964601f8664e6b995
font_01_sfnt_off0000f400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF400 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C12 21768 bytes
SHA-256: ea8eaeb7e86156176babeec690427dece49aa62b24e290da8ee31b58bede080e
font_03_sfnt_off000143e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E6 16232 bytes
SHA-256: 01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684