Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0103ba1d1f9e9a2…

MALICIOUS

PDF

80.3 KB Created: 2021-09-06 03:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b4e099646767303f4e2bc66cb22f7d30 SHA-1: 7d963f2f01fe26e1b43d8b00a74a73ca48279476 SHA-256: c0103ba1d1f9e9a22ae59710d0b9a035699146d7763c9a74bce09a27d0445d67
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://groupunsur4.com/contents//files/33505142654.pdf In PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/62710678899.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086658d940e5---vewobenuzumulu.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160abd4bda01d2---rukovunexeso.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/82897446fb7fb38b594eb05f324c14e2/49620142955.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/vasedofokavisogisufaw.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160714336be05f---47821253550.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/6ccacd29ed23dec2626e95e17b1a57b5/81148264017.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/liwelumisenusipojafoz.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/43052145006.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160915da3be2f0---52987933443.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/577916ndg7c16ac5n0it44agjp/zivafakaditovisuwalenudo.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/sipebakatotemi.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/diwowolibawujaze.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/1790a61bd6cff1733311f29221e3ac35/wunuvuxuxi.pdfIn PDF document text
    • http://meyanko.com/userfiles/file///99872019653.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16098cff157e45---xojexipa.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/a4kqh30f9o55o5i6lnflpp7uka/94041720995.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/76747155028.pdfIn PDF document text
    • http://www.puhito.hu/uploads/bumomojanemitaxazonupunam.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/sogukonilomobojexa.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/94199032185.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/6c985fa45b0bb3d6dcad11afbc7f651c/feduzide.pdfIn PDF document text
    • https://restavracia02.com/userfiles/file/39499469061.pdfIn PDF document text
    • https://petikdaun.com/contents//files/36253709954.pdfIn PDF document text
    • http://www.pvvc.cz/files/43178434352.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=engineering+drawing+questions+pdfPDF 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_off0000d31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 18184 bytes
SHA-256: 78cbcb8b52eb29c65c8942e4e88a57785e5944f91517e0868444acac00308d63
font_01_sfnt_off00010251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A68 10944 bytes
SHA-256: 03d62bd91a833b1cf87d19d450365245bb4281a70adb77d02b90850af634f458

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