Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8fe30d21e28eb0f…

MALICIOUS

PDF

76.2 KB Created: 2021-09-20 08:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 159009f8833104fd367cbd6f8ab66ac2 SHA-1: d8ec6332c3eb787ae0af65030f543ca852cd5a1f SHA-256: d8fe30d21e28eb0ffb9c2f8f255433b8a8458e714bdad94e0c4d82586e9c6c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, some of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.zolmedis.lt/ckfinder/userfiles/files/76892879316.pdf In PDF document text
    • https://pamukoglu.com/userfiles/file/25967240728.pdfIn PDF document text
    • https://copyjokertw.aw6.tw/uploadfile/qu4_qu106_com/files/60648993663.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613405063e0f9---xenefefedikonegomit.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/96401118471.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144353665f0a---fitifatubimifetudixu.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/7261583559.pdfIn PDF document text
    • https://mashura.co/userfiles/files/zugedevigo.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/zubojerin.pdfIn PDF document text
    • http://tythb.com/uploadfile/files/pigevofurixu.pdfIn PDF document text
    • http://schokofontaene.de/idata/43024187546.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/99531334023.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/44651508500.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/80680584424.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/xepokawe.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/40692354696.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613935960723d---16352747863.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c18168f7e3---11317764494.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/genutowa.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/venaxiwuzojaku.pdfIn PDF document text
    • http://steinbach.casawell.tw/userfiles/file/wuzafalonugobisaboluxep.pdfIn PDF document text
    • http://starma.pl/files/file/41612650854.pdfIn PDF document text
    • http://rurisnet.org/images/file/95553222682.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/26021959741.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/69930138618.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+share+files+via+nfcPDF 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_off0000c722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC722 10576 bytes
SHA-256: 55efd49fb0290fafa30eb77a1fef17fc692e68e1f981061e06cf216586c090f5
font_01_sfnt_off0000df3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3D 16916 bytes
SHA-256: cf2477ba9e88f7c3e45bebd04b3f1d46d9ec613ff3e2b39eb0d1a873a134cdd0
font_02_sfnt_off00010b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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