Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d09a3942f4b258…

MALICIOUS

PDF

83.5 KB Created: 2021-09-16 11:00:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 22b4c34ee11639cbc59ad9cef2c3a442 SHA-1: 7d5810f421f442fc0dfd73c6df1f9204d6026e6d SHA-256: 27d09a3942f4b2586d52720cb7a250ba17c738b2a299efebf5bd0f28c15349c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially leading to phishing sites or malware downloads. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution lure, aligning with Spearphishing Attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cosmosimpex.com/app/webroot/ckfinder/userfiles/files/sadoxomomudemasuwazo.pdf In PDF document text
    • http://hantechwelding.com/userfiles/file/2021090305580473499.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/zijodi.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210904_174824_6636.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/bufisiw.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161418c5145ffd---95643178921.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/94262826051.pdfIn PDF document text
    • http://nyett.hk/uploads/news/files/gurutuju.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/73158970237.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/29917130810.pdfIn PDF document text
    • http://metallpress.info/files/xezawefus.pdfIn PDF document text
    • http://www.contectrade.hu/fckfiles/file/foxozusetubanew.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/5376153473.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/jenuwoxugegixorelutawij.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/mufafodabapoxez.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/49819559576.pdfIn PDF document text
    • http://fygl.net/uploads/file/09090854438.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/161403c6487ea0---vutofi.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/60560367139.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e3fc7e92---mamig.pdfIn PDF document text
    • https://polenhosting.com/calisma2/files/uploads/nefofiwasomidovasoneveni.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd808dd212---woxutozedevabuvuzosul.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210914010001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dune+book+pdf+downloadPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613afc10513aa---sagok.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_off0000e1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A3 10452 bytes
SHA-256: f433d91c582d7a03f44cb3331b31418ec8aa39812501da35be624c9e9664ef8e
font_01_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 17936 bytes
SHA-256: 25bf5118fed0b2c92c0f909e5eb528747fe600a6aa9e0d50267e0ae8f782e212
font_02_sfnt_off00012844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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