Malicious PDF — malware analysis report

Static analysis result for SHA-256 79128e466024a0a1…

MALICIOUS

PDF

126.8 KB Created: 2021-09-05 11:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b12bd25badaf6f3ca1387d2a40de2e16 SHA-1: 452afb1e5c1751a9de82d2ca4a9ac11b6e960822 SHA-256: 79128e466024a0a1f54f55f344dc0d713a7f6c49f29134d41d48619cd4a42b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • 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.
  • 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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/3d246daa01ab4c0f98290be67da7065e/genorijil.pdf In PDF document text
    • http://salinahighschool1968.com/clients/3/33/33fcb9b832a528c934b1ac42c6b88a99/File/sosaz.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/mivupagelefosux.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/61358567589.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/1al0ds6r130malefbrq6vse595/35269821923.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jds7vki1aqftij53fiuppcu981/seluvamesekegopezonakaseb.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/38590024208.pdfIn PDF document text
    • https://membermimpi.com/contents/files/6520918528.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/bawuw.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb4da4f3f6---zamotegase.pdfIn PDF document text
    • http://epodhajska.eu/UserFiles/File/kowelinapipupa.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/58687153192.pdfIn PDF document text
    • http://psychologadamczak.pl/userfiles/file/lefejejujurozimulado.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/72994667297.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/97200463624.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/duzak.pdfIn PDF document text
    • https://invest.pl/userfiles/file/94415313795.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/sikejudasadowixawu.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/914908d081476eb00768f0df6e865c78/sevigix.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/susijuzukoxak.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/cjhs7sv6dnpo3oq3d208b361mr/jamevowonagila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fundamental+accounting+principles+19th+edition+solutions+manual+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E57 20840 bytes
SHA-256: e5bf730ac0dc5cdd664b0bd76406b84b3d51a9cb3a29c197ec2cd1847c8fda91
font_01_sfnt_off0001a442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BC53 16148 bytes
SHA-256: 1c024217ce21bb66922f73502146d3c7616b47413e2e194c36dd680b30e64e78
font_03_sfnt_off0001d1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D1E0 11364 bytes
SHA-256: 04dd45b2a40acfeaf4a528d8f17b673ec28209b8f314f043786b5fb8b46efa4d

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