Malicious PDF — malware analysis report

Static analysis result for SHA-256 824965ba1a739070…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 03:22:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2f81852e2d327a99cb2215225c554718 SHA-1: 08b0f85829dde3db5153eb7db3124de47840a555 SHA-256: 824965ba1a739070e5d83c139b4457aa960119ce78931781de3c4e3da3d32676
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://crewmak.ru/uplcv?utm_term=best+hacked+games+for+android+download PDF link annotation
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130706dc9092---xerejupekalaw.pdfIn PDF document text
    • http://xnucleus.com/members/member_images/files/77195789126.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/72471674003.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/d904930bc722fb8be02934c53905f06e/29414603871.pdfIn PDF document text
    • https://magerp.org/upload/files/difemebetepose.pdfIn PDF document text
    • http://haenuri.net/ckupload/files/19688632587.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/womepobisofawelosagoxo.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/resoni.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/67936311996.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1615246965757c---90704013964.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/efaf4d8e61cad59bba1638fe77fad10c/resijufenokubiw.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/41614076919.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/giwujoketebaxun.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/14655921243.pdfIn PDF document text
    • http://quimicahj.com/admin/userfiles/userfiles/file/96214320619.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614e9fc9c4570---dokaki.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/vujagujupolibarupeka.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/73202503828.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/97467361349.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///poserapepixanenogabeloso.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/zelize.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/161524e1f20845---ropomerisodelebijekaje.pdfIn PDF document text
    • https://kvizek.excore.hu/ckfinder/userfiles/files/30634233853.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/22b245gkd3f8akn354166r06f2/rilezenajijerixosax.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/81107145020.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_off0000b0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A8 11156 bytes
SHA-256: 9ceaea45fd303d2c3aa8844b068222363d9a1a1726f7c0a11e62d89b0e24fa3b
font_01_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE284 16612 bytes
SHA-256: e3652836072c4252c93173c154b968499879abaa6c22e719a8eb5ddcb98bbbcb