Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f72b9b9e70a3d1c…

MALICIOUS

PDF

72.2 KB Created: 2021-09-19 00:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 64c510c626c04591f7e85848fa181ba6 SHA-1: 122601a37f57c6cf5c34e1f41467c1d1c2f13645 SHA-256: 2f72b9b9e70a3d1cd727550ead8a834bb443c369e17e49794084a5dd9e3bca05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://krisoc.ru/uplcv?utm_term=best+app+to+manage+wifi+network PDF link annotation
    • http://www.bluewhaleline.com/image/upload/File/38645981118.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/fuwinuzerelakewozuvebezi.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/sejoxafifiv.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/dazogozisegopus.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/38891547812.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/bebaku.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6eb61cc40---48184214916.pdfIn PDF document text
    • http://schubert-hh.de/image/file/93659800153.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/vedelokaw.pdfIn PDF document text
    • http://proxima-online.it/public/file/97665154695.pdfIn PDF document text
    • https://shevian.com/images/file/81192291471.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109060942241822.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614095dec538b---64970290091.pdfIn PDF document text
    • http://freeorden.com/media/file/donefimumoradetikuj.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/92892476632.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f8f6abb0ce---vinilibomupev.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/sutigavad.pdfIn PDF document text
    • https://chogmai.org/ckfinder/userfiles/files/feladaretu.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/27271116204.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe5a04981b---71445213070.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/digutibusepedo.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///31093064530.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/71166664791.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_off0000b754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB754 16504 bytes
SHA-256: 766d9e52e48a16ee968817311ef2f09bcbfb2d3360ff1df475784db38d0eb863
font_01_sfnt_off0000e1cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 10884 bytes
SHA-256: 4955656ab8f62c26b8c5ae9a33861680d7440720cc88ba749b2e2fbc3da1c977

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