Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf70d87451838dd…

MALICIOUS

PDF

83.5 KB Created: 2021-09-01 03:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 0ec0895e78be5ab6f89907cbb05989b8 SHA-1: 27e2a7818e033a85c4278f9def15880a5a9651cf SHA-256: 0cf70d87451838dda59263b8895a3fe384812c3b944183eae2e8c5402df84331
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leavereview.com/customerinterview/ckfinder/userfiles/files/susewa.pdf In PDF document text
    • http://www.tokyomagic.jp/images/library/File/pinedaweve.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/41170416524.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/38581440087.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/926275914.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/45878fe30200ce2d9fc9a4cae4d20305/48895492335.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161143e1954a26---felapimawevaxeverelev.pdfIn PDF document text
    • http://generoussecurity.com/uploads/13313563809.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/xomofot.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/32107561201.pdfIn PDF document text
    • http://whatdwellswithin.com/file/64772952521.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/rosesozix.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/14380472ffd647a00ea54f9b41520195/17208976356.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/warizis.pdfIn PDF document text
    • http://treeoflifetolfu.com/clients/0/07/07f122ebb3396bb3f917f2e62af81596/File/wumose.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/88532148495.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/kumoz.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07f1ec3568---98212047484.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///72219993732.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/gakexerifizufavanamejonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=platelet+count+in+adultsPDF 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_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 16776 bytes
SHA-256: a3deb93de66fce77c4ca2894d83b485704f966ae96ea256efd773f705ea19a4b
font_01_sfnt_off00011058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11058 10364 bytes
SHA-256: d533d26e62e5cddd37a900dbd3133cf4bdf3e9f7ce49bd2fb4839654f954fdfd
font_02_sfnt_off000127e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1