Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b51cfc479f3b6a5…

MALICIOUS

PDF

86.3 KB Created: 2021-09-01 06:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5002fd0d4ebcaa65375e1cadcf4c990 SHA-1: e97ab494141a01bee5814240adfd3d25f7453754 SHA-256: 5b51cfc479f3b6a5a718b81310de0a9c271222f42deea5bac41b918c5864f3e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://allytemp.ru/uplcv?utm_term=supply+chain+management+in+hospitality+industry+pdf PDF link annotation
    • http://timnhanhonline.vn/upload/files/31332008019.pdfIn PDF document text
    • https://ivanamihic.com//files/jodurimajitef.pdfIn PDF document text
    • http://flirdining.com/uploads/files/xatotutigadusezenivi.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/fazosipexolagevaj.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/87191183324.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/tuvafatewid.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/febenigewobaropemematasox.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/7020968028.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8f1b6fa6a---83008385589.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075660ce2e1b---57059357378.pdfIn PDF document text
    • https://maturana.cl/upload/file/36017828975.pdfIn PDF document text
    • http://ylphs.com/ckfinder/userfiles/files/86605988368.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/97794024288.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073999e1d4f8---89858124035.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608628f9a7da3---99202313537.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/tirasaxetowikatavusimi.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/60073983733.pdfIn PDF document text
    • http://promador.pl/userfiles/file/834175650.pdfIn PDF document text
    • http://svx.su/ffile/file/mosodawesewutagirenewa.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/10284962737.pdfIn PDF document text
    • https://bangprice.combangprice.com/beta/cms_image/file/84451852046.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/gawusiwaz.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/20331090385.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/rugujozematulalowo.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/63300147129.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 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_off0000eafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFA 11356 bytes
SHA-256: e95d03c8c486fe209c07b44aa62f0b343e1e3b570f4c75daed42ce746714fd52
font_01_sfnt_off00010554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10554 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 17532 bytes
SHA-256: ae02c7345fcbf47b09ef7d4a0c98e89c68c73f45467a79b06e3a36a7f9ca5098

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