Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f3fb52d3516ed4…

MALICIOUS

PDF

76.3 KB Created: 2021-09-06 03:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eb73f3f6700e3f255ec5edf25e0be9f1 SHA-1: fcabafd094b9166b63639b7795bc12ca3b8880cc SHA-256: a4f3fb52d3516ed4ba7bac4c5dd148d1490c2960a1bf0598112081c33d8d4768
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or directing users to malicious content. The presence of a link farm on disposable hosting and links pointing to compromised CMS uploads further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://istocdukkan.com/userfiles/files/53715525680.pdf
    • http://kochamsushi.pl/UserFiles/file/bufap.pdf
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/wakawogikobiguvefig.pdf
    • https://pellevah.com/upload/files/67478173011.pdf
    • http://moderncarrent.com/user_img/files/sokakerem.pdf
    • https://artenika.pl/fck/file/limisosewarawiruvalojetut.pdf
    • https://angelsforwarriors.org/userfiles/files/pisukaga.pdf
    • https://globaldreamindia.com/webcms/file/42812329000.pdf
    • http://geometracosentino.com/userfiles/files/lipuwifekivuz.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/663ff129ba598c5ef1507c63c1c58874/lozani.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99a289a0a---veginesadojom.pdf
    • https://jurad.eu/files/file/tagujapasujivada.pdf
    • http://tks-forever.com/upload/2021/06/29/file/wunov.pdf
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/70411929976.pdf
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/lonotoxugozudafefalezo.pdf
    • http://adria-ex.com/images/blog//file/totagaviposarapufelejil.pdf
    • http://a-pluset.com/userfiles/81168253807.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/g8uvlf6hu8862023l0tt7u36f1/bokigufetumakumejuzamuwop.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/09a7f01882e92f8469df0be3721c11ae/97235796083.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c95ef535b6---tulubusedegofunojotizifo.pdf
    • http://softtox.com/new/userfiles/file/26655315774.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160b5613e3321f---86445450872.pdf
    • https://certifiedcollisionrepair.com/home/cert/public_html/ckfinder/userfiles/files/46148148253.pdf
    • http://suacona.com/clients/16856/File/26235722638.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56999129374.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5bmuodk72f0bpr8vghrvs9198m/20378904019.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=confession+of+economic+hitman+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c321.bin
0a25666a5f115cde2acb813995a1c054a3ce5c20df247cf7be8ebe4d76ea6e78
pdf-font-stream PDF embedded font (sfnt) at offset 0xC321 17980 bytes
font_01_sfnt_off0000f217.bin
2d1f243b4cba35a313403301d4e6e9c22d5ef1a5d65cca4db6f662efacaf0cda
pdf-font-stream PDF embedded font (sfnt) at offset 0xF217 10904 bytes
font_02_sfnt_off00010b46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 16792 bytes