Malicious PDF — malware analysis report

Static analysis result for SHA-256 a200630f97c4e794…

MALICIOUS

PDF

90.7 KB Created: 2021-09-08 17:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e25e3d798f755d2f2c8824c15d361b12 SHA-1: 7cb258c7b96041cd68fb4d30814509c22df31ef9 SHA-256: a200630f97c4e794ae93a518aa052e5caf9d209562844558edb26cd2da19dd78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism. No scripts were extracted, and the document body was unreadable, but the heuristic findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613185f0c57fe---79483677986.pdf In PDF document text
    • http://dakmoto.cz/obrazky/file/92401831051.pdfIn PDF document text
    • http://spharma.ua/files/file/3231217314.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/11546452430.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/fipifipogavimobagones.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/70041567105.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/pisifododav.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/gajawu.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161364ff696e2e---32605576081.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/44188084281.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/tifesujusorurovoxerijak.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/aa9f3162a8278338542081d756c232d8/pofod.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/26349832351.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/81630262248.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109041453159299.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/2333369333.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16132d983d597a---zaselenukotetuxol.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/wemuroxesebop.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/161357cf3621e6---kifutokajizirerojuxoseki.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/94023678047.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/70579811896.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/zikofeneloxu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161368910bc9e4---fufar.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/34627776436.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/gukakenedom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=civil+estimating+costing+and+valuation+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_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 18024 bytes
SHA-256: e3f2a8f142330956d59123a43d61fce97fa33508cff65bb517ee72ed52f6ee99
font_01_sfnt_off00012b21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B21 11060 bytes
SHA-256: 0ce19b9304d7eb092144df910e10f50c5bb08f5299504338b78ccb3f960b9f3c
font_02_sfnt_off000144be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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