Malicious PDF — malware analysis report

Static analysis result for SHA-256 40cbc09257e5f31c…

MALICIOUS

PDF

85.1 KB Created: 2021-06-17 16:18:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 677a5ec0906a826b0b5bdf2e9bf0f439 SHA-1: eda0d9a4930cc28e8b527d93dce920c485e0a26a SHA-256: 40cbc09257e5f31c73aedbfb74ccedc364e6a89e8d7f40b516914818f8a3dd1b
156 Risk Score

Malware Insights

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

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 0.9996

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://oniceh.ru/uplcv?utm_term=inscribed+angle+quiz PDF link annotation
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609876827598a---63639994468.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/j4eosqsiqc56gueudic1te1k4m/42821155052.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/89644664534.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/184f46a91668035736739858ba50725e/bomawulejubevo.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/a33e4998793f07be2b6b8a0aba586b6b/memefego.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/209513f5c90ef3ec4b1142e2e575186e/bevotaxutol.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609477e9a40ab---pulavivumoxuvir.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc1665faf---levakewipakuposirupa.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/murekapuko.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082ee97d06e1---77368298865.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/18667508809.pdfIn PDF document text
    • http://sun-eko.eu/files/file/lokowe.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/razafenenu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/408afad2b18e0a3ad2e64052e85b968f/sutulado.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991cd865586---romibilapujowinadum.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/kamurokunisituvepanutonaw.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off0000f0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A1 1672 bytes
SHA-256: 45bfc0b46b82874568ca65c132108d5741ab305c5a7efcdc7a8c3cb9c45efa85
font_01_sfnt_off0000f8d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D3 5360 bytes
SHA-256: a51bbe710ab9a0060a324b84793c8fa3d901b76c8c998b9ecfb6d679f8c13308
font_02_sfnt_off00010b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B17 11376 bytes
SHA-256: e542edd1f96933bd762d648281c5d55898eda22a7d90cf2fa93d5c29ade86fa3
font_03_sfnt_off000131b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B5 16140 bytes
SHA-256: 70e57ece10fb998464142c6fc9491f1da3c9cec01a7747bf7fb27faa4ca54fce

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