Malicious PDF — malware analysis report

Static analysis result for SHA-256 510f05dc2605b21d…

MALICIOUS

PDF

70.4 KB Created: 2021-10-03 04:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0018335d7f3e279cf4a6997be3ae3477 SHA-1: 31ee998b9706bb6dc381b193f4e51552d52427fd SHA-256: 510f05dc2605b21d98c6188875f5b0e0048f4f91f2170906883cf3eb81d9ee34
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised WordPress sites, indicating it functions as a link farm to distribute malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure points to a malicious document designed to lure users to external, compromised resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://coretry.ru/uplcv?utm_term=how+to+get+into+an+esports+team PDF link annotation
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614170a09f846---84888262171.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/rugozav.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///tabuvizimi.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2896da4be027509f22d9c93254dc059f/4470638955.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614333d079f43---gofaviwidadobutanulato.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16133edef25e2e---72682124701.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/57412365548.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/tikowevenevaruxafitimeno.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/xanazenumadi.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e91ae624447eb8f66dc69f58fa1672f9/73827972655.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/niralibepuvuguvib.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/98174681502.pdfIn PDF document text
    • https://ibericadearmerias.com/file/pesizimivulavome.pdfIn PDF document text
    • http://noospc.ru/SITE/files/editor/file/34244045782.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/dexopexuvamewimake.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210923_030307.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/41908558894.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/kegidagogesekigoz.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/906dfadb81fcc18cf408c42fbcb8a46d/zeganoj.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/25058902825.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136127ed39bf---suvexa.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/20943028512.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16157f8b0bb284---mukalozidum.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/75258039805.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_off0000b03c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03C 10624 bytes
SHA-256: 1112f90d4f823b379cf878af13eacfb2c04d7266f7cb84db33e641200fd5ab1e
font_01_sfnt_off0000c896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC896 16292 bytes
SHA-256: bbf0434d0124a4cab666e87bda199350b6ac3ce40f67fcc983319959a9e4753d
font_02_sfnt_off0000f239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF239 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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