Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd4a69baad8512f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-17 08:11:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c0f3bb12162a7b28a2a151682169dd8a SHA-1: e4e09301bc10a4a32087910c3452e4c2167b8ddc SHA-256: 5fd4a69baad8512f25f59674065acc1d60218cfc9f27c68985d594eb52985c5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, forming a link farm. This pattern is commonly used for phishing or to redirect users to sites hosting malware. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=hatsune+miku+shinkalion PDF link annotation
    • https://mosconi.net/userfiles/file/fulibedajebidap.pdfIn PDF document text
    • https://baglab.pl/galeria/file/noxawunigarigoxusuw.pdfIn PDF document text
    • http://singer-island-condos.com/userfiles/files/99730917071.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210903083720.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/lamogonadi.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/napimepipumekemoxipiwa.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136f62120fb6---9129009694.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fde52313ef---38530999120.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/36685057662.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613bea7b9449e---34808085472.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/somagakebivikapimiruzal.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/50830791834.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/fukirakodod.pdfIn PDF document text
    • https://wtmasonry.com/ckfinder/userfiles/files/2587394337.pdfIn PDF document text
    • https://ksuskalology.com/images/file/xaruwurol.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/tojenizelimugibizusaga.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/noliragezutugewokodoviv.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/xasusuloguta.pdfIn PDF document text
    • https://epgeptech.hu/ckfinder/userfiles/files/98027989207.pdfIn PDF document text
    • http://inphilong.com/upload/files/57450256581.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109131736519876.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1889ac73b---libuwa.pdfIn PDF document text
    • http://www.huntsvillepr.com/files/files/lizakel.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/silubevobon.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_off0000d038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD038 18716 bytes
SHA-256: 319c3423ab70758989b161660eb8e3c77cf49ecb5cb08220b9151b95c180faad
font_01_sfnt_off00010156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10156 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001196d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196D 10456 bytes
SHA-256: 9a601835d75266d9449db64d8c10583aaca0757100403d0784711e6aea22058f

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