Malicious PDF — malware analysis report

Static analysis result for SHA-256 e472e86a0b614688…

MALICIOUS

PDF

84.1 KB Created: 2021-08-20 13:15:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df1c93edc649c4359e1f5d7c6ab42eac SHA-1: e79df7a515b93a0cc8e7e6687a5749e7d8248824 SHA-256: e472e86a0b6146880daa5a304e249edb22436b29f0fdc6b952d41b96324f18a8
96 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the link farm suggests an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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://chcial.ru/uplcv?utm_term=open+sesame+cookie+clicker+cheat+name PDF link annotation
    • https://balbok.net/admin/ckfinder/userfiles/files/33041665541.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/d23df61b222f57e167791dc3c7d6c2ca/56435767353.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/1f614eee6aae254d1a39d34640fb72c7/zipabofubonobenujig.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/4653766761.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16098be51d3f5e---40017210752.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/30490124359.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/mimetetidotajifanezi.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/54179524471.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/56c97f0e4035a6037fb1bd8896d361c0/tolabamizijepe.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/dutezupigu.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079518324f91---jetonuwuvobudawakif.pdfIn PDF document text
    • http://geodez.com/pliki/file/76433504589.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/38949612399.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/vaxofusiwibapoputur.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/nilotugifa.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/91047502056.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/70695694368.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607932c41a7e0---vakaj.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5a1f22d1ec---85126879457.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/76da98d97890ae4ffb03f4bfbe916ece/86858001681.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608294ede1f22---lagatofusom.pdfIn PDF document text
    • http://easttbirds88.com/clients/d/d7/d767393c090093bf18db16876c07b5c3/File/38744476901.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be77af98135---nolubegobawejex.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/brm9o93jstkk2a8ij53k2hr2u5/zowetomidabilogijawodu.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/fiweguguxenanilaxufo.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3fbd49ec---gafuxarik.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_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 10756 bytes
SHA-256: 185146fb6bd93f9037d497576f3c847ac306a55c6a3d08305e897a1d8d8cb5b9
font_01_sfnt_off0000fc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001144d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144D 17984 bytes
SHA-256: 490236e2f8ba18caeb2556770aebbb0f625ba4582c1df31d4e6b7373d9318754

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