Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf8eafdcec27731e…

MALICIOUS

PDF

81.7 KB Created: 2021-09-09 02:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 06276a9c0f013e16e90ae344403132cc SHA-1: 132d94c41e076d68b049f043693555b6547ad560 SHA-256: cf8eafdcec27731ea9abfe33515f54fc4787448f5ace36f8ab0c3e3a06c493ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous unknown URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://rivebistro.net/ckfinder/userfiles/files/47915104111.pdf In PDF document text
    • https://fishboat.hr/files/32849157946.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109081703225448.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/161335922d0f7a---36706569413.pdfIn PDF document text
    • http://bftt.marketsearching.com/upload/files/goronad.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/semisuxevakakaregewis.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/xufefo.pdfIn PDF document text
    • http://www.espace-hotelier.com/ckfinder/userfiles/files/41524918548.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/budigotuvip.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/kuzemuwodovonidoxozetup.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f846dcb27375b6563ba8bec205839803/57696295065.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/51334675061.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134687c21b53---71754717708.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613503db43184---nubewezuxunuriloke.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/mezaf.pdfIn PDF document text
    • http://ellissi.org/userfiles/files/75298542130.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/9785258791.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/vomiminafejebololuzaw.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/78415371864.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/zigimow.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/73770508714.pdfIn PDF document text
    • https://nistd.in/userfiles/file/43090569575.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/tugedorumotuwoma.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/vipoliv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=the+infinite+game+simon+sinek+pdf+freePDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/fuxexarosarabolik.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_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 10956 bytes
SHA-256: 014da1e090aca08e4be067adf2b8e9eb9bb3cbd48f6b05565bd1f25be6d7f40d
font_01_sfnt_off0000f34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 16876 bytes
SHA-256: 037f559c8ee4de38abf8ada73086a12ac4c935a6cd13599baed1e775fd5ac942

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