Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b683788baaa22a…

MALICIOUS

PDF

88.7 KB Created: 2021-09-02 06:35:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4eedb9e5d94bca879db4e9dcc8778b98 SHA-1: 57815a9afd018946667b21546af787ed24f1b612 SHA-256: e2b683788baaa22a7fc31968520b3b74dd9ecd3914497b2dd220fd84e52808b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of multiple external URIs and a link farm structure strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • 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://anaksemut.com/contents//files/29658105155.pdf In PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/38280347361.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/55721154585.pdfIn PDF document text
    • https://agatanorek.com/files/file/lumuponuziwurekeliv.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/789765cab7120a1139de1d299f4620f9/58081499720.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/645b3db514d4b5e1be47828ba6c8dd93/donidig.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/gupajixok.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/tisuwenijogasurazaxapa.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/pinomewikuvowatamalixofid.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210715093617286040azs7ri.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/1419188249.pdfIn PDF document text
    • https://elektrona.cz/files/file/89466933330.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160924028193b5---didelu.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/9c92ea04424559a90234c757bd85ed43/81412271260.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/kimavumafer.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/xikijofewepipuvuxadegug.pdfIn PDF document text
    • http://contextuae.com/resimler/files/norojivupabegegonetugaz.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/pekide.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795c8690fe5---vutijufawimazuxesuvipexu.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd01cee235---13675107336.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mekojujorokuvul.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160803cad80084---dafunadaju.pdfIn PDF document text
    • http://produccionesproezas.com/clients/2/28/28ea8f13eb032e89cab2838ec144e7af/File/paporelisubuvabugomexifa.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/21067965416.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=icm+refund+policyPDF 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_off0000f0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C4 10520 bytes
SHA-256: ec7bd0d7165dd383d2800a17054d5963a032548e7a558bd53ab568778c8f8d43
font_02_sfnt_off00012097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12097 19392 bytes
SHA-256: e353861b229f67f125ad726e31011dc2632e4f4d958c81579d66d6332954eb14

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