Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b636ad8f86a8cd…

MALICIOUS

PDF

379.1 KB Created: 2022-03-06 05:18:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-04-06
MD5: 9d641ad351b8f5f3e427cbe21d382ec4 SHA-1: d53f5fe95cb6ca289be72b28ae2ee13efb55a035 SHA-256: a8b636ad8f86a8cd5850213e5443fb2ecff00cde21c8ebae61fe440a24b0456d
246 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.6428

Heuristics 8

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION
    PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
  • 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.
  • 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://norin.co.za/XSRYdR1H?utm_term=aged+care+award+pay+guide+2018 PDF link annotation
    • https://tbsva.org/Upload/files/20220208075555.pdfIn PDF document text
    • http://stapi.org/assets/kcfinder/upload/files/jevegegal.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/26b9742cfa204325cb759938392f4805/wometaduxagegewug.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20220208085221.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/64193942581.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16209a86a88cba---rinarifirefovijux.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/162134604c117a---wirikulomoki.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16204e5df56e26---pojil.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/lebivarowogipemevuvizebaw.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/20470016412.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/pafedugi.pdfIn PDF document text
    • http://xzavod.com/kcfinder/upload/files/kexil.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/63623982889.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/fazejijafajus.pdfIn PDF document text
    • http://changzhou.chinatupai.com/web/js/ckfinder/userfiles/files/28368970524.pdfIn PDF document text
    • http://ongxoanhdpe.vn/upload/files/kibiwunatisigowewulodik.pdfIn PDF document text
    • http://cocoal.com/uploads/file/makibusob.pdfIn PDF document text
    • https://www.tahreek-a-khatmenabuwat.com/assets/ajs/kcfinder/upload/files/wuwobu.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/fuwalokatoruwemavinixakab.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/mofalolikisiruziraj.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/napunapofowu.pdfIn PDF document text
    • http://saintthomassolapur.org/admin/kcfinder/upload/files/36139763681.pdfIn PDF document text
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/24654436530.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/21581926804.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16213c72813042---15682044681.pdfIn PDF document text
    • http://congtrinhxanh.vn/media/images/upload/files/niwukob.pdfIn PDF document text
    • http://metaphorcreators.com/kcfinder/upload/files/xupukiv.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 extracted file (font_00_sfnt_off00057ff5.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off00057ff5.bin)

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00057ff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57FF5 10936 bytes
SHA-256: 5823daed39ff2713f676dbd103e7c0f41ab63b018b5846ba2bcd184aeb4f5a9c
font_01_sfnt_off00059962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59962 16560 bytes
SHA-256: 924ad5cb737cfd9a34472b2046831991df4d3950e5f0d7b552a18309318c2ee9
font_02_sfnt_off0005b07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B07D 17280 bytes
SHA-256: 2fb2274ac3f4baf684810febdce67956c4c99c1e89f81c17422ddf7a844f2e38