Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb80a0ed76ea5e6b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-21 11:18:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1429bbd2f25a9363a991e155853db88e SHA-1: 963e70905baef25200574546a24f44d675f1430a SHA-256: fb80a0ed76ea5e6b34bfc36c584c2ab34fcd7dca69547cab07ed99c5ca9307a9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, forming a link farm. This suggests the document's primary purpose is to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=nfs+porsche+android PDF link annotation
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/18817924132.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/perimidivemotef.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/peruzisabaxajozegozax.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/50824141022.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/jamoga.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/mesizuribanibamexewomorut.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/zugusaxutim.pdfIn PDF document text
    • http://iltorg.ru/upload/file/31074167658.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/sexiforodetonefabo.pdfIn PDF document text
    • https://cukimentescukraszda.hu/files/files/bovanezom.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/58665437514.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/79731988060.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161317040b6ac0---94905448132.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/ganisiwetodebuxuv.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/31696213182.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/jubuvejopizolezaxojajob.pdfIn PDF document text
    • http://aquatherm-graz.at/files/savituxedumur.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/dobuxerofugeruxuxumavi.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/bapuse.pdfIn PDF document text
    • http://ageddfjtjgrade.pretty-match.com/upload/files/39344525246.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/mofigu.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1631208404_867ac5273e.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613765fd76613---vilexi.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/o37vou7ds2n740lnavovtnrt60/jotinosaxuvorenaperogujum.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB318 18728 bytes
SHA-256: 84fc9fc593f958b5da97b954eaba1547f8f4563a64de004e2fac4d8fe647cfbe
font_01_sfnt_off0000e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20D 16132 bytes
SHA-256: 071bac7a3a90310621307d68123817e30fba7c89f9e5021c4391eb43bd8b9137
font_02_sfnt_off0000f785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF785 10548 bytes
SHA-256: f0acb844f2518b9ad4f960216c71a8831d57dc74562bf8f475e9c369aa220584
font_03_sfnt_off00010f76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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