Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b224354f6a4c1b…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 06:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d32104dad192007b76067989391c1f5 SHA-1: df91b418335d38f9008f56ec5173de92d28139a2 SHA-256: 93b224354f6a4c1bb57f019928335cd68ff91b36dbbd05245bbc75ed7d6c5828
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6837cec8---guwegezedojok.pdf In PDF document text
    • http://ddservice-bmw.pl/userfiles/file/29366195543.pdfIn PDF document text
    • http://grimastone.ru/files/jatezim.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/44186905715.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/feliroxenaf.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144ba023c8cf---porosomopufepel.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/supubilujikop.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a1426acb245ab949d6016376dd7811fd/90631066827.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/zovidaledazexoxipefonirod.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/54865371879.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/83555537944.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/71799089703.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/nevaxunozu.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/42016768495.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/37777015233.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/volazoj.pdfIn PDF document text
    • http://peoplefineart.com/assets/202109/files/20210909202001844853.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/96551579856.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/26858943870.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145ab6bd6c8c---61946961355.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/winonapezutusebunirajunab.pdfIn PDF document text
    • http://jadeite.ru/images/file/17000954862.pdfIn PDF document text
    • http://timocomputer.cz/files/file/tifirig.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/76309513687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=the+play+store+is+not+workingPDF 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_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 17964 bytes
SHA-256: a2449556b7d4ab38e5fb98f67f5d76a416577098a026f79cb6a2614160623e73
font_01_sfnt_off00010560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10560 10788 bytes
SHA-256: acfe49e061a61b4053b5d4a65b6dddde631db13454a3a5d4422b0795d7e0bc71
font_02_sfnt_off00011e50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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