Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0fc8e0e3121e102…

MALICIOUS

PDF

114.1 KB Created: 2021-09-03 20:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c588a7164adedbf6be90a33a9969e71a SHA-1: 20d98a9bbfd53ea1245af69385f85bbe7f02505b SHA-256: b0fc8e0e3121e1025f6ae7aa6d1239e95db48c708225fa295e563387acac24f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://smidgel.ru/uplcv?utm_term=traitement+du+syndrome+de+guillain+barr%C3%A9+pdf PDF link annotation
    • https://afritransport.com/app/webroot/files/file/wesitemajetifojopapekowo.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/woxojuluzirudiz.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86c9b0f835---46689895413.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/rekofenedowu.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/jefuworon.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/pobezanojalefakidi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161163409cf2a4---62997781872.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/3uv46ieavg8sj0bh6369s1p1se/46633606279.pdfIn PDF document text
    • http://stpatricksreunion.org/clients/84553/File/tukedowawiluguj.pdfIn PDF document text
    • http://benetalent.com/upload/files/xabavagapibagifap.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/bixetigise.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e504366083a---4199439294.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/rarok.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/uubdfn1vfib83glve71b4u9r3n/56276953725.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/zosinitununasojirafi.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/nawubegamaziten.pdfIn PDF document text
    • http://hi-techfiber.com/userfiles/file/85174350057.pdfIn PDF document text
    • http://moristas.com/userfiles/files/xaxiduw.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160db56b6b3253---26643548686.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/67785019613.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/30370532223.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63ecc37b4---52396915899.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/54b2ad873bf7a94b4dcf277b244cc13a/2177276346.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_off00014be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE4 22776 bytes
SHA-256: 8ba4a0d728e016979274efd9a66c56120e8dd50b75e175a6c4299c512c8d6fb7
font_01_sfnt_off000185a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19DBB 11312 bytes
SHA-256: 2b1ad5ce300023f5d21ca659108a8090db946a5d38213a581914817553a06875

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