Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c10ed8cfc707d86…

MALICIOUS

PDF

80.3 KB Created: 2021-08-17 12:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d2f757db00e7833188185974cff01eaa SHA-1: fce1aa8a8fb8217764033724297436d1b7a4c4a9 SHA-256: 3c10ed8cfc707d8683234a21ba62c7238b96fcd6d4b9527736c9785fb78efc0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to potentially compromised CMS upload directories or disposable hosting, forming a link farm. The primary attack pattern appears to be redirecting users to external, potentially malicious sites, likely for phishing or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 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.
  • 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://zerling.eu/nico/images/files/lonosakuruwupeduxumebil.pdf In PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/58917e7c93b0f26b30407cca9f8d3261/patogikideditefedo.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/tezuki.pdfIn PDF document text
    • https://www.bistro-e.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607716ee1577a---tiraz.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/gf61lrquje7upg9q8k1vj0pm30/99153662855.pdfIn PDF document text
    • http://trunglamdecor.com/uploads/userfiles/file/wutepidokoro.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/najigavigisewamovoriduda.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/96176873057.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff29f93a5e---90051055946.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5e66b1c2f---nosomizuloki.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607579319e2ec---5047719087.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/51507854109.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/7053100315.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/xewunobojemofiv.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f42437d9b5c---12806026053.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160fffacf6b7ec---bipivedugedobikelem.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/i0foehvgu74bqghg8hqgnt5sjv/41631619740.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/tefujamorufum.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/vemevezenu.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/gozimi.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/92657607729.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/binikigubewemaf.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/goxibusikosapumi.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/23907977075.pdfIn PDF document text
    • https://phuquiland.com/upload/files/luwagonokejosuraw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=n.+gregory+mankiw+principles+of+economics+8th+editionPDF 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_off0000d0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A5 17188 bytes
SHA-256: 107a503f83703a8581328f1b3f6a5e2f18203eaad233cb58b3b4b4e4242ef9f2
font_01_sfnt_off0000fd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11568 11612 bytes
SHA-256: f0696c2f4b57dcc91e6c19c928e8a436893264c37d1f9ef3c85e3b27aef580fc

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