Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c78633ab0ebcfa1…

MALICIOUS

PDF

84.1 KB Created: 2021-09-02 08:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc7ebf7f2e5c909a5f5e8ac9b8eb350b SHA-1: 8cfec9ef345f60b3f14fcf02f3d90f78ddb3911d SHA-256: 4c78633ab0ebcfa1b22696a9feddb1106fc1657d979dbf9737e34d57151d4c06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to facilitate the download of further malicious payloads, likely through embedded JavaScript or by tricking users into downloading files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.tzounakos-insurance.gr/ckfinder/userfiles/files/buwefazoxadolerusipap.pdf In PDF document text
    • https://ludifrance.fr/userfiles/file/vukarup.pdfIn PDF document text
    • http://hungbuloon.com/media/ftp/file/81242031141.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/63366837566.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/55450616480.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/77357011507.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/vaxoputirinaxo.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16093e708a3acf---26598197990.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087ebc5904c3---dokufut.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51299780738.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/tasuk.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb80714e241---47432548285.pdfIn PDF document text
    • https://medtek.vn/storage/file/65141725132.pdfIn PDF document text
    • http://daiichibus.vn/uploads/news_file/resunowanevapisefiz.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e3e84b690---vugedobilubudimakedosawok.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7042a004fd8c36ce06df4d58ffdb9cb1/24717663028.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/piretaje.pdfIn PDF document text
    • http://xiangzhuan.tw/upload/files/jegaletisilenuwenoxaw.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d28634691---92838026381.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210705_8F04E9E36959242D.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e2a0565ebba---44876318015.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/otsi2ir2omog3vsvenai07t0u1/komurikexibesagobivupuf.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/mugokusowani.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=jersey+tamil+dubbed+movie+downloadPDF 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_off0000e2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 17808 bytes
SHA-256: 86ec56035fa1eaca149c4c23a2fd902e996f574a1671bbfda2bfdd8210839402
font_01_sfnt_off00011113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11113 10904 bytes
SHA-256: f827344c2f574c592cdbcde94de30bf55be4ce56f1dfa22a08532fcfde753bf4
font_02_sfnt_off00012a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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