Malicious PDF — malware analysis report

Static analysis result for SHA-256 f548e59df760fc9e…

MALICIOUS

PDF

82.9 KB Created: 2021-08-15 04:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a67437bae7a757445308d2e4806872ca SHA-1: 90530d0d71f29828876fffa220068b6eb1dc91e7 SHA-256: f548e59df760fc9ec93302f5a446f670dc0ba043e28f600438b8fa601972cc9f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external URLs points to a common tactic for delivering second-stage payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://chcial.ru/uplcv?utm_term=youtube+mate+free+download+2020 PDF link annotation
    • http://cuacuontoanthang.com/media/file/14512376641.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/7d91c41d9171edbf29917c38c0653318/xuvakigi.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a93aee79549---53757547377.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210813_286F480CA6043E05.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/guvikimemujiraxurufubawib.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/57368608654.pdfIn PDF document text
    • http://schs1968.com/clients/861610/File/70631649721.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/daxabeb.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/dc98d37d296c3d6518f2a9da739a0cf8/kojonanoxutujukiboliga.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/86941254787.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c62c62cef64---kokeviwika.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c738bf7723f---51205920016.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/13232591212.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f0e5c3721---41491139613.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/91328054455.pdfIn PDF document text
    • https://menu2uplus.com/images/file/nodifotupukudexalanexusi.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/1783423612.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/2ed5fa862faffc21e208fe74c5d3c4a4/mudewisuvunutari.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0ada865898be5547f09ab5244d91f323/begori.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/092b928e717d600eddd47c6f0871d1bd/jirizodilixunatavurevara.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/91398136769.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076333728bb0---58833957171.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///jozikosefumemanelaxoz.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_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 10808 bytes
SHA-256: 74c6528435951c47d57dccc3991ce73d1b45d81646f5db12098fc89b096f1847
font_01_sfnt_off0000f78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78B 17732 bytes
SHA-256: 9392cd55b51026746325fe0326eff52449e47e2948fecb5e41c1e24a972adfa5
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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