Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b072be5102c331…

MALICIOUS

PDF

75.0 KB Created: 2021-09-26 11:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a7397836ae2b34df181807e80a9aa6df SHA-1: fb643f4d599c4dc7ffdc073e01e7d40fb3c2cc04 SHA-256: 66b072be5102c331d5979d1871f097235f450c996eef61c44cdf3c1f6242c46d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress upload storage, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://cephedanismani.com/images/pages/file/lufafomusosixemevofe.pdf In PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/kexobefi.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/22482500341.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210912111031_l0s5u9.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/luvefapazorezorofuzuje.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/39690689740.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/kupemawomojokam.pdfIn PDF document text
    • https://www.pension-chevaux-haras-gabereau.fr/ckfinder/userfiles/files/17047568955.pdfIn PDF document text
    • https://pruexx-com.invenq.org/images/files/didabokewa.pdfIn PDF document text
    • https://newsale.linyn.mobi/upload/ckeditor/pages/files/62951388348.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161430af58f984---dadozesobi.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/gipawokepogixuxe.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/jobogojajezizotudor.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/nukosenubegaxamupapifawax.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/biwidurojuvovanojadawotis.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/88823842067.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/mepubifunizusuxopaluta.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210924180646.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141cc87e05f9---sunowarafa.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614094e5508d6---gipikupif.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/95879184493.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614649bc86788---99390457220.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/37601730953.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/ae4e1be15c60f52149736a92a28fb742/tovasupinaris.pdfIn PDF document text
    • https://armour-technoz-ca.otzol.net/ckfinder/userfiles/files/gabuja.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/75473945194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=minecraft+pocket+edition+android+cheatsPDF 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_off0000bb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB55 18436 bytes
SHA-256: 16a518c3705fecb9c9ed06e12428f6d48a9db29d97e99a57ab429c17578cab46
font_01_sfnt_off0000eb4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 10756 bytes
SHA-256: 622f278ef3e11a7a160195a6220c33937087c7762069836161187d4c69a67b5a

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