Malicious PDF — malware analysis report

Static analysis result for SHA-256 14e85476b1caeca0…

MALICIOUS

PDF

85.1 KB Created: 2021-08-19 23:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6ba86b6fd7bd92fd786e08f3d81ddda3 SHA-1: 3546811406156850ae70d65e0c573d37148a2f4d SHA-256: 14e85476b1caeca0f733fd99d3689c1d33041f73ebcbb985dc8f0477f17da07c
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it's part of a phishing or malware distribution scheme. The presence of a visual download button further supports the lure to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://thuduchouse.vn/pics/file/menibadunadep.pdf In PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/jinonuwukagavelir.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce55baac2b---tejojuxo.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/zojifadosevozewon.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/bomumovubanilupor.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/57485429413.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/1678649314.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mikinatowevixolimin.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/70367480817.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/ae053a94b1f5a035b0d32a0ed3b1d34b/35547310314.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/ladufo.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/gamanozixi.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0a6a1bd454817038ec14c125b93fcef2/makabudulet.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/af7116f421bd4445da7400c22ce53ea9/47115705507.pdfIn PDF document text
    • http://mtntoproyalshihtzus.com/clients/4/42/42f4769cb4f2467af64fea76c5682520/File/pogozemiwelivogumi.pdfIn PDF document text
    • https://seikai.jp/free_images/files/mewis.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/besanuwisukoxenorigox.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607f1aba1fe71---96912725607.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/bumikopisiwefizawan.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/91061539707.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/30684737083.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef0318d1c---fododulinaferawo.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/9b22469e23e896f42d20c54944785ff2/rezikofimekoboguribu.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/fanozudavigabisifaro.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/kenajifufaxowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+reset+code+for+kwikset+powerbolt+2PDF 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_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 16808 bytes
SHA-256: 78e8f9f914cfbe8150452aaa64d66e0b8439c03e8e717874414aa8b28e30c317
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 10776 bytes
SHA-256: 627dcce09d20fbed73873b2d6ae3312d1679c8023b9b1cc2146b83e80792ac76
font_02_sfnt_off00012dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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