Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f67bb7cab967060…

MALICIOUS

PDF

80.5 KB Created: 2021-09-14 11:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 66f5f2fb42c598b7a91a12edd4933bd6 SHA-1: b23ba89fb3023a66651dd8e550fd46b55af3b1d0 SHA-256: 3f67bb7cab967060ff640b17ccfc4dc7642b485c40dfd69f27670332f9969862
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external URIs. Several heuristics indicate that the PDF is part of a link farm hosted on potentially compromised or disposable domains, with one URL specifically pointing to a compromised WordPress upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://waterlootour.com/FileData/ckfinder/files/20210904_7B5AE316EA339FF4.pdf In PDF document text
    • https://bushregenerators.biz/userfiles/files/20840340117.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/feroxafogudejozarifawibi.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/sufekila.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/xepatadugoron.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/20551222497.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/modonalab.pdfIn PDF document text
    • http://bamor.org/userfiles/file/vumuvinuvok.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/996102927.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2787857e9b649889e528210a07a05547/jivopoberiruletisovogob.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/42060711846.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/vorububovowoma.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/98757273498.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/4oehd99ddnuocj96icmvc17emn/40405048026.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/44881507783.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/47469293825.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/dobajaganewufup.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ad5792882---divezefuvabatiridon.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/47875377207.pdfIn PDF document text
    • http://sieuthikhoacaocap.vn/upload/files/13291708548.pdfIn PDF document text
    • https://spyboarcams.com/files/72013225863.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/43087496789.pdfIn PDF document text
    • http://sungder.com/upload/mijopodeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=video+video+downloader+apkPDF link annotation
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/josusisowerejiniri.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_off0000d5f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F3 10332 bytes
SHA-256: 2bb41142155f5efe97095da6e51d54350e6888edf8834561220203cb4eb21e25
font_01_sfnt_off0000ed57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10569 18188 bytes
SHA-256: ca419f96e0c75c49fdc394ec3e21d629d18a15cbe00d8a37d9fb331fa14b3f5b

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