Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c80482f1d4d2cb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-09 00:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fb67c6ce9f32001e92d11f25e11ece68 SHA-1: 9f682292459d72f48922479703e11e093c68e0ca SHA-256: 37c80482f1d4d2cb39a6403c4ba61f041fff95198c23893ec11078e8e44ad445
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains embedded JavaScript and numerous links to external PDF files, many hosted on compromised CMS platforms. The presence of the 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to obtain a password for an archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vietkinggroup.com/uploads/userfiles/file/marubarijifemadivovakas.pdf In PDF document text
    • http://nusratali.com/userfiles/files/munafidudotiropipi.pdfIn PDF document text
    • https://wanna-drive.nl/files/File/59339568314.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/fibed.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/lujuleduvoluponuma.pdfIn PDF document text
    • http://autofactory-jin.com/js/upload/files/luvowiku.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133342ba1eac---gipixekotusalolafigis.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/99964974564.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210905143136421016gn6kzsikv8jg.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/bopovoras.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/dafomosimiwiputo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392d361d470---67308701127.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/66454566188.pdfIn PDF document text
    • https://kenadong.com/contents/files/mumixabavukaponomidi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3560b8c1---64663551167.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/majixeramemupofo.pdfIn PDF document text
    • http://wacommerce.net/home/integrity/public_html/ckfinder/userfiles/files/relupaluguxidej.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109032245193079.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/86485117527.pdfIn PDF document text
    • https://ferropula.hr/files/78554009660.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/polokebesuguveginevafeta.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/zotemiduxadeguje.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210906135937.pdfIn PDF document text
    • https://ww150004.linebot.net/upfile/files/20210906061452.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=download+ebook+greya+crazPDF 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_off0000d4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E3 17724 bytes
SHA-256: 09bd20255b33d07c60979c27b88a609c362d5596d84152bc32d699280bebf4d2
font_01_sfnt_off0001033e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033E 10680 bytes
SHA-256: 680665dd32bf42aae8479f3e73b5cfa5b88557f626a82a7d1db9b097d4625dde
font_02_sfnt_off00011bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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