Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aeb57f63143df96…

MALICIOUS

PDF

71.8 KB Created: 2021-10-04 05:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 7b5109cfb66ca400d35eab1f7d43bd7b SHA-1: 87df9febc10ea502be2f12bcb946c85834b525ed SHA-256: 9aeb57f63143df9673680878a1ff86cbd52d27414c4d2af0fbdae403cde9bfc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm intended to redirect users. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://synerhu.ru/uplcv?utm_term=graph+theory+west+pdf PDF link annotation
    • http://chipublichouse.com/ckfinder/userfiles/files/zilizijawosamuxir.pdfIn PDF document text
    • https://equinox-e.com/upload/files/95568549242.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/zevogonawude.pdfIn PDF document text
    • http://temple.mo/userfiles/file/revuribevulosomoxejatol.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a18a222192---wesogapipijuzirasiv.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/c1263572ffc74dd361184375c1ff85e7/kemasuxodewolemapupugoti.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/69457007055.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9bc54d279---80245565556.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16131486a5cc14---vigilinewop.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nuxasikifelix.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/32137223457.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/sizifidakokogovumuliruf.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/70443274832.pdfIn PDF document text
    • https://ldcpc.com/ckfinder/userfiles/files/merazipoketigosuze.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/napin.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/3381953605.pdfIn PDF document text
    • https://hssanesteban.cl/files/nigafizigegumu.pdfIn PDF document text
    • http://m3hotels.com/userfiles/file/46385977848.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/64451202188.pdfIn PDF document text
    • http://casaledellasignora.it/userfiles/files/97392147252.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/puromojamidudobige.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7235961013.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/tetenipamus.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/16457508943.pdfIn PDF document text
    • http://aztkgbv.love-mrt.com/upload/files/97563123058.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/33960acb092bd01bfa31a3b93e7b381b/mewunozumisakorudu.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_off0000b5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BF 10592 bytes
SHA-256: a428b6bc5b886139bd9ba6803ce4abc5b6280f890cc1c2587eb1c1d29bb9906d
font_01_sfnt_off0000ce30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE30 17020 bytes
SHA-256: c372ddb207772dfd48f4cfc952784200d78ba33ed55c6a2cd5432ed6db9a4fc6
font_02_sfnt_off0000f93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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