Malicious PDF — malware analysis report

Static analysis result for SHA-256 d473a69b2d5d7865…

MALICIOUS

PDF

113.6 KB Created: 2021-09-04 09:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3032768f032d0c7f85c2b03a5acb1238 SHA-1: 01a539f22c8f85754513fa5c01f3f7dd918d4185 SHA-256: d473a69b2d5d78658c0ef7e41a26e4dcf8d73ee8a7546285b1b42d0031e951d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or engage in phishing. While no scripts were directly extracted, the nature of the URLs and the heuristic firings point towards a malicious document, potentially delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://profession-your-dr.com/uploads/files/202108281436171036.pdf In PDF document text
    • http://sarlampa.ru/upload_picture/tusinowokuweroxusexow.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/durefivozowixideperakaru.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608530d8ea1ed---sogivejelareboxekedebe.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c46b5c79694---78492826416.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/gejolomejitukaxirisozeg.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/rudigi.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/17957906100.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79a294ae4---nokigerijirovoxapokanafi.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b06683ac675---xukizijevoxaxezi.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/20613812078.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/gafekexagejuxigurizel.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/79499468905.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1f8cea4ab---pasujepuxufazuke.pdfIn PDF document text
    • http://uco-kampen.com/media/files/23543732606.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/pogupusumafevinivapaj.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/jovomokoxideduduvumise.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/73273912348.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/30enboluola9fhg53kbvcqddl7/52409117857.pdfIn PDF document text
    • http://ketnoikienthuc.com/upload/files/64834530016.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/xewefikofupavoduvedanav.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1609c619b9cc22---6703224899.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/600ea0a0d27d4f503bc2f5599317cbf4/61501398373.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607d98a0e77b8---85548703987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=anamika+academy+one+liner+pdfPDF 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_off000156d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16EEA 19144 bytes
SHA-256: 9d0e2ed361e79bf0345dec1e8ace0b5547d3a291ea2cf0524a8eaa490edd5509
font_02_sfnt_off00019ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FF7 10700 bytes
SHA-256: 65ae4f16ce2d86d15e237a15144d021872215702ef438f15e7976d3488f3fd1d

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