Malicious PDF — malware analysis report

Static analysis result for SHA-256 354b6cf48c92b88c…

MALICIOUS

PDF

76.5 KB Created: 2021-09-17 15:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d078eff83b7556a179e0fbdd85f2525b SHA-1: cfdfcded99c81057d122522c453dea1e5556f514 SHA-256: 354b6cf48c92b88ceb81f5ea0073c9375c7a3983b194f2627e82d965c5fac1f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://synerhu.ru/uplcv?utm_term=minecraft+pocket+edition+0.5+0+apk+free+download PDF link annotation
    • https://bdlvn.com/steel/upload/files/wupegakivodijazaregoruli.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/45153902185.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/rafonewuzumigupuzidomig.pdfIn PDF document text
    • https://senesi-sklad.cz/userfiles/file/38718227278.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/tebodepegudobalaxew.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/31684145270.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613572e27b3d2---xajufirifatuvekukitoras.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/64080140302.pdfIn PDF document text
    • http://tubesealer.com/uploaded/file/627299179614029da0803c.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/55de1d2aae33eb462f698f2ed10ef2fe/49623627827.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/5374909013.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/1c80669de33b64c7133a39075ff358c5/sadumudikaveso.pdfIn PDF document text
    • http://kant21.com/userData/board/file/42956449937.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/gemorez.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/92573185806.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/53980551942.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/31793479495.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/mifexazakulun.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/zelopubogixaxugedabekepu.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/42636224165.pdfIn PDF document text
    • https://oazapiekna.com/zdjecia/fck/file/31169103903.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec610a822f---bezaruzudutalenukil.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_17_17_30_14_7181.pdfIn PDF document text
    • http://slavutich-media.ru/userfiles/file/84508766996.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/29001988846.pdfIn PDF document text
    • https://illinoisfiscalpolicycouncil.org/app/webroot/userfiles/file/62552955159.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/78580929205.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_off0000bfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFAB 10940 bytes
SHA-256: a2cb72ca7da8c6b4eeca7a96e9090c17093f81b331a5f666a387c050ae9c5115
font_01_sfnt_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 19068 bytes
SHA-256: ddbc083248a1a2514b3c31f28f2eed66aeff2eda57f5ffae1cea4575c3c9e6fc
font_02_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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