Malicious PDF — malware analysis report

Static analysis result for SHA-256 7139ea5bbb1603af…

MALICIOUS

PDF

90.4 KB Created: 2021-09-02 20:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f85d509815ffa9a10323897cceb5f51f SHA-1: 0e063ee50c002f2079cb7495acc04411dd1d21dd SHA-256: 7139ea5bbb1603af3597ca14f17db38972ac9ef091750f3cd31e4f23f98e6819
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous embedded links pointing to potentially compromised WordPress upload directories and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating an attempt to distribute phishing or malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://oniceh.ru/uplcv?utm_term=ionic+bond+vs+covalent+bond+worksheet PDF link annotation
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce19460928e---78000206986.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/9e35ef29ada4196c20b7efaf0a54c5cc/48298393526.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ae955320cea---1428674983.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/79122777526.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///danula.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/292118473769.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/76b94f187310c335ab9256a6e70c38cf/72380526295.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0235a3553---5749793311.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a33edb776---xuvinuxasagidis.pdfIn PDF document text
    • http://relatives-united.com/clients/75139/File/jejejurapalezego.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/jemirasomopaxakavikaliz.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/16197402560.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/jvonahlrbbmsi7m1lo167u01c5/jatojimek.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/voluk.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acbed95a3cb---67560353605.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/50920414088.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/wirifovosadosabujidine.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/roxufuwud.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160763130f3405---rilijilivonesadubu.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8b0562b10---rogarovutujesaj.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/bb7d2894fab71f5cabd9ef08c36f86cd/24982017001.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021061823132313.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762b9038d45---62401891134.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/gifatej.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_off0000fcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC0 10800 bytes
SHA-256: a28cf3abc6299a58dedcb7b5112bc535076c9bf5480ea2f9dcc89ff9ec31aba0
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBF 17804 bytes
SHA-256: abf732dc915aacd5a80fafcea7b960fff317c3afd19e5fcfff5b53b618af0658

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