Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ef892379cbdd20…

MALICIOUS

PDF

78.0 KB Created: 2021-09-06 05:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: eec7f89bf442893fa1e300a94feab0e1 SHA-1: 233363d62b77ff58b835335dc7f152f269c4ffec SHA-256: 24ef892379cbdd20e4f404025f99ea55941b47bbf72dabf45606a3f2d1ef3d39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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 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://archism.ru/uplcv?utm_term=nesco+12+quart+roaster+oven+manual PDF link annotation
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abd0ca000ab---jeposenefivar.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/rowimefat.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/detemapovuxokasipex.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/87684887102.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210702232338.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/97792805793.pdfIn PDF document text
    • https://rosycaffe.com/file/70576507150.pdfIn PDF document text
    • https://pmms-online.com/assets/file/69255012238.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/48679878353.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608b670275def---poranuzofuxurupojavoj.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d39258df79---vunipasodajovipizuxeliseg.pdfIn PDF document text
    • https://csn-alliance.com/data/files/73124633144.pdfIn PDF document text
    • https://pokereshop.cz/data/file/36459253039.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0544c06ca9c4d1474616e410a675d9f8/masozobatikisag.pdfIn PDF document text
    • https://gerastar.com/userfiles/file/50739359450.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/23a66dfb611911e120e556e61bf82e04/jerexu.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f56221d69---rojipijifuwis.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/sawanetovujukagum.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/83057896291.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/58117511342.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161106aecd4448---28533838392.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/54101596758.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af0d37cb8d9---zigotiga.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/rowomojalozejawe.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_off0000c9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C1 18056 bytes
SHA-256: ae9532de6fbf20cb410ca03aa5fa0c80b6c8bac3181b651d7a7aff68a8696320
font_02_sfnt_off0001114b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1114B 10760 bytes
SHA-256: 20c6a0608b85799a64c1579ccf306c4ca0f8053b31fddba19a7f7ca2f1d8d0ad