Malicious PDF — malware analysis report

Static analysis result for SHA-256 18a21684e9413b0f…

MALICIOUS

PDF

79.3 KB Created: 2021-09-13 21:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23688326cf44b2f6344b819467154a46 SHA-1: d6b04ad35845e5cb731d6e328ba85a6099955646 SHA-256: 18a21684e9413b0fd67ab0e9b8833d963b5c9d59e0b1aeca5f5f32e4ba08319c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is a PDF containing numerous links to external websites, many of which appear to be hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and link farms suggests an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=three+steps+above+heaven+full+movie+english+dubbed PDF link annotation
    • http://bright-mineral.com/uploadfile/file/2021091208444020.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/56212891428.pdfIn PDF document text
    • https://actorconseil.com/files/file/jifowepomegobagax.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/bofedebanini.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/60990826668.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/27302746614.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133edc6ebdd2---47093772287.pdfIn PDF document text
    • http://ashole.hu/UserFiles/File/80294273012.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c20f38efc2---jajivixawepaxu.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/46242912741.pdfIn PDF document text
    • http://asvpp.fr/pdf/62224286998.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/71965197080.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/37421669120.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210903112427.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9888c257b---piwimow.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/64043092212.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/54119016402.pdfIn PDF document text
    • https://questyme.com/userfiles/file/mumukigewimuket.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/88552006919.pdfIn PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/duweverabizixanurixalugi.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/29564093588.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/24445697030.pdfIn PDF document text
    • https://pasarantogel.com/contents/files/batefemanovasimod.pdfIn PDF document text
    • 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_off0000cc3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 11212 bytes
SHA-256: aca1a4207a4ca7399253d475803fbf79d9a908bfeb76309870555ca8eb1b714e
font_01_sfnt_off0000e5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 18920 bytes
SHA-256: 99289e1ab30c805791017072a34786fb77d4e9ce307eeae4b587f2aeb1040d7d
font_02_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1