Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b0b09945aaed10…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 21:25:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: edb97e6ec8c0bcc328ce029119aeedca SHA-1: 5b8f3b02b3daa598ab7ff7943153e3a5a20b6055 SHA-256: 81b0b09945aaed10fad44709ad3b7fc814906bd7787164fe3377b90c0c447e18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of embedded JavaScript and a high ML classifier score further indicate malicious intent. The ClamAV detection as Pdf.Phishing.Trojan confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/6e81cacb880b3a0e2fcc65d6162db3a2/93550503326.pdf In PDF document text
    • http://iberryhomemade.com/userfiles/files/35135413249.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/20178689260.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/21054932867.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/65222734273.pdfIn PDF document text
    • http://stimatacasa.eu/userfiles/files/bizoguf.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/16094724286.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/02045c059f0fb81e3c960e067d9139b9/zerimeboj.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/risusumonum.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/4211252105.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94f81351e---papetem.pdfIn PDF document text
    • http://baovethanglongmb.com/upload/files/91423285652.pdfIn PDF document text
    • https://ski-valloire.com/ckfinder/userfiles/files/57857884213.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/bizod.pdfIn PDF document text
    • https://adurucui.com/ckfinder/files/dazikovazedalabojused.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/wejemog.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/77097320024.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/rajilupe.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/45114499922.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139003b5a9a6---sokoxenuzorin.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/pefegewojapiretomaji.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/januzikerav.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/jl5op55agmjd7h5ebhph0gp0u1/22987767817.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/bivibozojodumuviser.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=best+android+coding+appsPDF 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_off0000efda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 17392 bytes
SHA-256: 694d81124f1ee5e0973cbbf986b808467b185768b1a127979aa9717e8f76c9eb
font_02_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 10696 bytes
SHA-256: f72ab871501744d8b2d43e9e37f3c2e3640a7e2fcb5826b01a00810060650650

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