Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f9b6bb7ac013cd6…

MALICIOUS

PDF

106.4 KB Created: 2021-09-07 03:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 50ce3e419dce7757d672d84469c89a43 SHA-1: 7e5f9a34512f9d4f7ce0f2ff2d6cd93ca514d57b SHA-256: 9f9b6bb7ac013cd626b4283dfa2c581211e8e0d3964505463a79f7dfd2547207
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to potentially compromised websites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://nemdanangpho.com/uploads/2021-06-09/images/files/92037512772.pdf In PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2e7b1838---tamutu.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/larujexolitumoxidipowak.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/62644054868.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/pekoderutidu.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/fokukukelebanuruwam.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/jabibukilaxejekotuza.pdfIn PDF document text
    • http://cherishedmomentphotos.com/clients/8/84/84fe84b553acfcd191e166b7401b6f02/File/kowezazimabafamela.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/88201783090.pdfIn PDF document text
    • https://hurtowniaroza.pl/upload/files/54865878963.pdfIn PDF document text
    • http://fxmeat.com/upload/file/534f6c6c8ca1be6560ce1c019f303837.pdfIn PDF document text
    • https://noventa.cz/media/files/file/runazizuwonabavomiz.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/lilixuwilifeka.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/zibogekodosudubizowebuzo.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8e64a69317a26bf5985948e7cc55ea7e/56084890763.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/moxenenewofazivawedidaku.pdfIn PDF document text
    • https://vitanov.rs//files/perimowebiku.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/63740915941.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825fd78eb85---65697449477.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/zebixe.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/955f615fe047304e402ad4bfd1ca8297/17624627112.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/fatufibosutinikivejuf.pdfIn PDF document text
    • https://netpage.info/userfiles/file/44746675460.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/45346911812.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/rabuvojutojinudas.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/77109803479.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=satan+libro+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_off00013461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13461 21240 bytes
SHA-256: b429d8ddfb5e55fbf53a9ee87c34e5f92110d9a1da4ce553bc2f8b55b69c3c4f
font_01_sfnt_off00016be8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BE8 10408 bytes
SHA-256: 0dfe1a401be97d6dd5b783557dcbc83b617b8675ea3720ed78f6a3c91b481865
font_02_sfnt_off00018355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18355 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1