Malicious PDF — malware analysis report

Static analysis result for SHA-256 63db682473c5ddcc…

MALICIOUS

PDF

82.4 KB Created: 2021-08-23 16:51:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1bee6d1ee4176db9e4e77ced5e73fe80 SHA-1: 576e230efde66878fcd08d549ebb83a41e71892e SHA-256: 63db682473c5ddcc0ab6b4f68a46a3f62b0b0608bd364e0ffe303b0eafad6b1e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs that point to external resources, many of which are hosted on compromised WordPress sites. The primary purpose appears to be directing users to potentially malicious content or phishing sites, aligning with the characteristics of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://oniceh.ru/uplcv?utm_term=prayer+for+sister+in+law+on+her+birthday PDF link annotation
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160707b0ed92c0---kujuvagado.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/jsla8k5kus8lbdbao0hs1iadfr/59604573162.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/sokizegegejogepadixofeta.pdfIn PDF document text
    • http://falls67.com/clients/50406/File/71954342912.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sn4uqua4p2m6ghsmf1kukk6u23/lezid.pdfIn PDF document text
    • http://zgic.ru/!upload/files/lezosareja.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b27eaef01---60719886269.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/zekijifufinivejivibu.pdfIn PDF document text
    • http://studioagm.it/userfiles/files/57267182280.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/t843u8nlv5o5vl5s62c1vvg16e/vibivufulijurezume.pdfIn PDF document text
    • http://soluzionebenessere.eu/userfiles/files/doduvemanevixezanop.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/kafiluwox.pdfIn PDF document text
    • https://bmw-zona.ru/uploads/file/gadixipowiz.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/pojafagurofudilam.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bacbb02bf12---gowinowikotizadefevizef.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/pesaro.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210810_067E3FB185A4E94C.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/1197591a01bf3db3da2e9f76e4655fb8/rorofujowagofopekexonov.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/83137306515.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/fa472bfd485f20baa66ee2ef174e38ee/37358615433.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/zovobejixexowoxokijuvefi.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/71123652602.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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 10792 bytes
SHA-256: 61b086721ffd0453efed52d9b5113f85f499e5d9d455ca10b84c589ac1ec2ee4
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 16704 bytes
SHA-256: fbaba4505ff05a3939e0a91a5ad0c5982cfb762b29deb2e629bef5d5c93223aa

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