Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a478639bbe74d65…

MALICIOUS

PDF

75.5 KB Created: 2021-09-21 06:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 769a5df2293af768b9b15034c5aa06ff SHA-1: 56a9481f468f78d90d6425671d88a974d2518aea SHA-256: 1a478639bbe74d65fb18fa4cec09a0b28a39e8f003aba0d21b70fc5614abcc5c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs pointing to link farms hosted on compromised WordPress sites and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript, though not fully analyzed, is a common vector for exploitation in PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9855

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 https://atasuorganiktarim.com/upload/ckfinder/files/42811636770.pdf In PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/govolezizo.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/renameruxuke.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/16710855406.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/degiredubidudoligota.pdfIn PDF document text
    • http://herve-coiffure.ci/files/letepojamudifa.pdfIn PDF document text
    • http://bannails.com/fckeditor_userfiles/file/34351409472.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/pimupiguj.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f333ce5d22---55823817173.pdfIn PDF document text
    • http://tjchenxing.com/filespath/files/20210910040410.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/3c894dafbdfcc5e72a47094f4d9f9b69/73949210371.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/g08l9jdag4l8stfoccrfsj58a2/56414208192.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210919180510.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/gomizumilomisi.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/guwesagifowafekitidov.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/jijazogatavubisemita.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/wasiwiruzabagotujaf.pdfIn PDF document text
    • http://gunjanjain.com/app/webroot/js/uploads/files/zomaminar.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/22847483834.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/63058812035.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/22784034535.pdfIn PDF document text
    • http://medrea.ru/upload/files/dejegejubezarijadeko.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/53204051240.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/mutijisisa.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/nutoponaperovifawag.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/83602397362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=captain+america+civil+war+tamil+full+moviePDF 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_off0000c287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC287 17356 bytes
SHA-256: 3e263577b4b6747f4e9f68b2266ec3ac954c72c6c886a539a88a6fe05c0e722f
font_01_sfnt_off0000efbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBC 10756 bytes
SHA-256: 8a8f6e03028e956bd91cb1cd76c33c8eeb180d4d5371fed277a7c24e30ab4507
font_02_sfnt_off0001088c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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