Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc0e49535260dbf1…

MALICIOUS

PDF

96.8 KB Created: 2021-09-09 07:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 976f83ceccde8ca225aebc0295ff0436 SHA-1: de22aa3f7c38b5237c93eb912232fcec21446093 SHA-256: bc0e49535260dbf1d55c4f5d00650ed51f31792c6f18d4beb5831b4ac9dcae2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 7

  • 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.
  • 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://nct-vn.com/userfiles/file/daloxixekafepekafupu.pdf In PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/61704359728.pdfIn PDF document text
    • http://www.bash.cl/media/file/53757535159.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613212aa988ed---64139147401.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/namofupifezobadaniruteden.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/susuwinisosoboxedevaw.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/rumorojixogadoj.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/16808703987.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/43596070472.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/53947035524.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/45098120924.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313f9af3e4d---78194413073.pdfIn PDF document text
    • http://www.ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/rezerinezunege.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/pikepaxexugatijalikuvod.pdfIn PDF document text
    • http://sparan-art.ru/ckfinder/userfiles/files/fadevusorusum.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132588a98f19---93127052307.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/43700563012.pdfIn PDF document text
    • http://npas.ru/pic/file/38706281947.pdfIn PDF document text
    • https://travelone.ae/userfiles/files/xunit.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/kunev.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/teveberufe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134f13f50aa4---62047761288.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210908_085037.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/puxezegakuwuwefolukex.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/jekuwavepefofametuduju.pdfIn PDF document text
    • http://sevvalturizm.com/rsm/files/rureretutuwixotuxoweli.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/70869514415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+do+you+write+in+an+email+when+sending+a+resume+and+cover+letterPDF 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_off00011099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11099 11176 bytes
SHA-256: b4459c66ca20ad9aa014fdf2df45736a9e0cf40664109f63838bd31194e116d5
font_01_sfnt_off00012a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A6A 19300 bytes
SHA-256: e86fc6ffd95afc461715b473c3fcc7fa89c08790419de7c971d7fe247ba5edbc
font_02_sfnt_off00015c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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