Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ce7af11e3a46d4…

MALICIOUS

PDF

63.7 KB Created: 2021-06-20 10:53:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69bacbdc061d5cc20ccb90adf537c843 SHA-1: cc2fadcca9177fa469480c38252b5c9403c01d68 SHA-256: c1ce7af11e3a46d4b777efcd81a4cd96c50b04e2704a84c43c543ee3b5144079
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://krisoc.ru/uplcv?utm_term=invierno+porte%25C3%25B1o+guitarra+pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7c4acdbe1---50665747090.pdf
    • https://psfund.org/public/uploads/files/cms_files/losijos.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abc290a682---vabojagerezimerutoraj.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f55308273c---xafomatajujuguzuvuwuba.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/nkgr7d66gtrdk2sen0h5srut77/lowasedugex.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/5inisebi1gl18dthq330l5g623/16701368622.pdf
    • http://alexhoffordphotography.com/temp/files/file/wezikisusasibevetonorib.pdf
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/tuwufubawapofekedalozel.pdf
    • http://www.anjhimayath.com/upload/file/wakinonawabixitotifi.pdf
    • http://barcelonasixtytwo.com/userfiles/file/lusoz.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8d82b5811---zitumoxebomokaxo.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3ff7fa22---xifowimajunaduwati.pdf
    • https://aljuboori.com/userfiles/files/77232972075.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/demufipasevan.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092bf1033246---gakipenuzononofeve.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b789.bin
d10b739afff10e959e14b32102d3df12dea91eade35dfff2768f15d70c7fe57c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB789 5208 bytes
font_01_sfnt_off0000c91a.bin
3bd657ecd38ab40def25e9d1e1139d593fcc202ed749a68c0f7edeb71740c7df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 11692 bytes

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