Malicious PDF — malware analysis report

Static analysis result for SHA-256 409eca59c3d1cd6c…

MALICIOUS

PDF

75.6 KB Created: 2021-09-06 15:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2de4b80466e48159a13fe37490afb30c SHA-1: 1edc26b51da3df88aa360aefb012d61bafdccbdf SHA-256: 409eca59c3d1cd6c533f536dc6e178f6374373f2a10b9290e5173720d298d1d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=assurance+of+salvation+lldm+pdf PDF link annotation
    • http://midesignvn.com/uploads/files/19032615583.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160baa51743f80---35316085190.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/wizesaregebibukuwomejojo.pdfIn PDF document text
    • https://synersys.fr/contenu/file/pepisusogufeniruba.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/sozagezagig.pdfIn PDF document text
    • http://tms-technology.com/ckfinder/userfiles/files/jonagopuruluwunededuzopak.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/matukidosilogobew.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/3d4132ca839a818dca224bd527c044de/5777051776.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/68415457941.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4d6ca8ef8b445fe3c16d1e741ab3f63d/69485089835.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/3lkuepbeullm7gk2n8kdulfa73/40682776512.pdfIn PDF document text
    • http://hidropro.hu/upload/dipokolemezuzesijasoz.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210817155319429092o8398oxugt1o.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/41451315915.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/dufebiguxalawub.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/6758146344.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/58567986341.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/10883399138.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/65014605407.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/66483458017.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/84615509097.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/83793840172.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/pusalowozelojanut.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_off0000c35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35E 10928 bytes
SHA-256: ae8d63dc5423650fefeec465db77a8a7b038b2cb429cad6f9497435d7a9d4feb
font_01_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 17000 bytes
SHA-256: 658a45dd42d1b7ad76935c8502455fb1304aecf567d8f70e0f4a68e62d9da863
font_02_sfnt_off000108cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1