Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a65013877b56cb1…

MALICIOUS

PDF

82.0 KB Created: 2021-09-01 06:55:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: dbe362329587b09d751be6f1e18b5150 SHA-1: 40adc3b95ab42f6f453306e0d0de8d8a0e145dc0 SHA-256: 2a65013877b56cb10531d72e025f053d8d6a13ed1ab21e2d4c094f75044e8c63
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The structure and numerous links are characteristic of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://ya-ke.cn/admin/upload/47513338151.pdf In PDF document text
    • http://cdhsalumni.com/clients/28864/File/18533499910.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/98148015104.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/11153272741.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d247e38b95e---46402592682.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/f14d0356b9f7146e15e83d6a528729db/74528850920.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/jekijudivuramoramaregujod.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210730014916_gds4rv.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/20059422140.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/12116811882.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/fadatilorokisanaw.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16098b07488264---78605169924.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/zagoti.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/24848819035.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc0eaa8a5---2765047760.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab2f97a3c5---lerinemanijarenivuwi.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/e2pqghvh512qc8t3vdpj98f582/fewaj.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b84c2833f2---sugusevirowixobudazi.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/25087492673.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/86189932413.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/31b38b1bcdc3614a6617f3c6fdbf56a5/tazogezadokubisovu.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/7582750170.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/22060553676.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=equations+with+extraneous+solutionsPDF 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_off0000d8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FF 10620 bytes
SHA-256: aa296d903f6ac2d9fa42ed7d40e92885811610ee302c0441051668093ff1af45
font_01_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 18308 bytes
SHA-256: 4d57d06ca78a8a3727aaf5d5e5cbb53e8b72bf39d04a399435e4fbe0a716e3f7

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