Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d0ec7998c7bf3e…

MALICIOUS

PDF

78.7 KB Created: 2021-10-15 17:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 96b482cc2fcc033c3e5650c97f87312e SHA-1: 44e586989232da8bc2d450d4f5e5a55b95d6211a SHA-256: 88d0ec7998c7bf3e1e739895cea07ae912964d25eeda31380237fc25ef59ca09
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://solidpractise.com/files/userfiles/file/74428082641.pdf In PDF document text
    • http://polins.org/public/userfiles/file/giwoluzijuvalovorerib.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/26356171576.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/noxewenajafetek.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/11485866639.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/nogilogokigu.pdfIn PDF document text
    • https://red-adlay.com/upload/files/79927948827.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/zofigibi.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161589163f18a4---zodugezosebarera.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/18442298963.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/18184333647.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/vakoboramutowa.pdfIn PDF document text
    • http://bndweb.nl/upload/files/93276791887.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/naluligidukakidububa.pdfIn PDF document text
    • http://glassick.com/userfiles/file/pafod.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/atrqgs86bbutbmgckqr8l99rn0/10987605620.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/55718901336.pdfIn PDF document text
    • http://feminella.ro/upload/fck/55155753805.pdfIn PDF document text
    • https://longhoang.vn/upload/files/40282945846.pdfIn PDF document text
    • https://fuoriscena.eu/file/semupefemagizul.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16168044d0a453---33066584859.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RC0zOYPQW8A/uplcv?utm_term=kelly+hu+phineas+and+ferbPDF 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_off0000cef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF6 10720 bytes
SHA-256: c51edf0c74df9b15bedc4833ff5729e0780694dd442f635f69e950e17a954f28
font_01_sfnt_off0000e73d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4F 17800 bytes
SHA-256: a03a19b40373937b164d7ffb4c7cc575b6d224a2506b01a423674e88893f7402