Malicious PDF — malware analysis report

Static analysis result for SHA-256 66061a6c50e3551d…

MALICIOUS

PDF

78.0 KB Created: 2021-09-19 00:19:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f35afc7925a7378ef4158c4c77a8de6 SHA-1: d436609e4713398f288f5d4a461a7ea5bdb93b7a SHA-256: 66061a6c50e3551df376895ce51eb64e5217faf427ffea402127092b4e6decfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 http://4rrecycle.com/files/file/kurerebetadokafapo.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145feee53302---gufuwigebivam.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141938b3bcd8---pavuzapo.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/91432958774.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/zafixazasagepaverimufovod.pdfIn PDF document text
    • http://xenangheli.vn/public/files/28645859215.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146537216f79---rowagavobirogek.pdfIn PDF document text
    • https://ratosatu.com/contents/files/82594659990.pdfIn PDF document text
    • https://vicareyou.com/userfiles/file/mebuluxafe.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/70412196771.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3bd90d07c---57796728527.pdfIn PDF document text
    • http://skia22.ru/pic/file/wafizepinerujajezu.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/64821733575.pdfIn PDF document text
    • http://jpiano.net/userData/ebizro_board/file/89608717293.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b8fe2abf6---4086201096.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/mepesiwizikukimaku.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/lewema.pdfIn PDF document text
    • https://imihwa.com/uploads/image/20210910/files/20210910101304.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613075d98d81f---pibidijozuratuwo.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/50055336061.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/vugupulosurimovesota.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210914_7D0C1A9F5EB74AC6.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/mofep.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/gujisudagiwelejetupafogil.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e4a3b0751---pobexetazofunujutukamixe.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/bavuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=iphone+4s+32gb+price+in+bangladeshPDF 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_off0000c7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AB 18488 bytes
SHA-256: ff89323ba7c94ac3b50f7d8f3a0fdde85313712887680ebf8dee3b708d8df989
font_01_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 11156 bytes
SHA-256: b27f4312b11d9330ebc4b0549231623828cf2d783d5308b7cc1355270af77d52
font_02_sfnt_off0001120e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1