Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ce8a6820f3552f…

MALICIOUS

PDF

79.7 KB Created: 2021-09-12 15:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ce933995cf67a9bfe5066bc931637c65 SHA-1: 5431cafdad34b469dfc9b5f59a5e0f0052e70ea7 SHA-256: 14ce8a6820f3552f926400ad58387fa3de85b73b4c97f2bc23f76242a027b9d9
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 or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1p0ofpu672fkcc4odmj65thb7k/97275662699.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb73446bd5---44691517576.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/rolufujumevurib.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/digijafewidoxasodufutom.pdfIn PDF document text
    • https://unaizahic.com/Files/files/5077075059.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/kitilalajakak.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/tobirefiturozawem.pdfIn PDF document text
    • http://moretonassets.net/userfiles/fatimobidukixa.pdfIn PDF document text
    • http://soupworld.de/upload/file/77637692242.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/98271936047.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7f007cc9800c7a4d2af0bea00d82f2d4/84629943439.pdfIn PDF document text
    • http://flomojapan.com/upload/files/26577532618.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/fudolujutugepolililibiko.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161328207c7344---zapunovaxatoniritisuxe.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/51959603790.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/44819064671.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/36271632732.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/51981297060.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/63168578249.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/zupojamitanajobiwa.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/62570548928.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/37369781061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vidmate+update+versionPDF 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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 18228 bytes
SHA-256: 50e633333bc173cdfd8fd0b61341b9c8fb08fbcd34f6ec2bb3b7351207322190
font_01_sfnt_off00010088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10088 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001189f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1189F 10644 bytes
SHA-256: c59c7e915ea81b26fc4a9d0789414b47d7838819acc9c0375773918093f41b69