Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7173233427650c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 06:02:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c9546ac8bc88c13d1ad3527b710ade86 SHA-1: 95c30a1c1c0ad2ed7d1bfd8a9ffbb01375ae0ace SHA-256: de7173233427650c74786f25f209fa665cbb11a4a2a025d2660e41f9ab29f4b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a link farm and the ML classifier's high confidence score further support this assessment. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=download+bluestack+for+pc+windows+7+32+bit PDF link annotation
    • http://pointwebhost.com/calisma2/files/uploads/99087942577.pdfIn PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/fodomakeraneduwer.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f86fbb7ef20081e708b893a5c7a9a5e2/vafepadarafugetodez.pdfIn PDF document text
    • http://sudeoksa.net/userfiles/file/20210904100945.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/rowimezudof.pdfIn PDF document text
    • http://usateatop.com/_upload/files/27443281968.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210906081832.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/tijesabojilijojaxene.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/61239700000.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/be3ad2208dd6eda5889d8424dd521028/nebutuxaliba.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/fipizedixafisufonud.pdfIn PDF document text
    • https://petikdaun.com/contents/files/malerexakevuwupabapolir.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/80536243963.pdfIn PDF document text
    • http://wrtour.com/FileData/ckfinder/files/20210903_0372AEC0AB57AF4A.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/56181453402.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/sasasid.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe2247bebd---vulunasu.pdfIn PDF document text
    • https://adikkedua.com/contents/files/nasetudujijataxilefalar.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/66102501044.pdfIn PDF document text
    • https://lazerom.pro/media/file/xetarili.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/55213232726.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/57354794472.pdfIn PDF document text
    • http://slsnn.ru/content/files/foserijawunalifu.pdfIn PDF document text
    • https://afma.pt/site/upload/file/10562950129.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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9C 11372 bytes
SHA-256: 878325fd8c8fd5be67d06c562c6342b6d3e5d8562b06251b66738bb7d2d12cfe
font_02_sfnt_off00010a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 17084 bytes
SHA-256: 4881610f5dd8737a2904f10803836af72286909737325dfa859d9abbdf6c1f3a

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