Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf01ca5c8dd3e50…

MALICIOUS

PDF

83.5 KB Created: 2021-08-03 10:55:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4e4a19da89bb0e24cdede5fe66f08d5b SHA-1: 1a81b5e5449002d31a4c47dedb7713c98863bb90 SHA-256: 9cf01ca5c8dd3e5013a48b17c980bb1447f8cbf75f4696f8098aada97d33f249
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links indicate an attempt to exploit vulnerabilities or trick users into visiting malicious sites, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fa3464b7fc6---bixulipaxuvuzexuxanibatuf.pdf In PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/mizarutujegij.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/susadifowedikumam.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/46234105690.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084b21dcd295---xodisetoxew.pdfIn PDF document text
    • https://cmoretv.com/userfiles/28696460032.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c89fa93f6---pawaxe.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/ad0a25fc7c5a6aa24c5be3565bceeee2/sezavexidu.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080237f0c586---7669744128.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/64252378896.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d67b4beb285---21600058811.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/64449819901.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/8198a12056b687f2fca36198347707b5/xaletupawotazarilelo.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ce1e5ec9f---43663381665.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f1bae74e7---tefajamitezekifudunopum.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c823dda2f0---nuvedasivep.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/55631915272.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/bubizepa.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/e971fdb485f44236d730b9af8206adb7/xibisusodet.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608e87c9bd4a3---zirujezaginefagepogaru.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/7s36gsfn0343rrkokhoc8aojk4/42758848810.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/74794266811.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/044de5bf6974584b50f36c17125cac56/27472387630.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/14of7ooe7tk59fsl861rpm6up0/pogetevunirumot.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/wilovaramizunulazer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=important+facts+about+micrometer+screw+gaugePDF 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_off0000e289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE289 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 11052 bytes
SHA-256: f30a56971e658730319fdecea8efcd661e4a357bcd83500f6f3b135d1fe2b263
font_02_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 16332 bytes
SHA-256: 53c274773346efb5902d0116998d77a2f14092cea532088dffac3662f0aa2249