Malicious PDF — malware analysis report

Static analysis result for SHA-256 56a35e821352f6d5…

MALICIOUS

PDF

85.3 KB Created: 2021-08-24 05:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3f55c931f5c9ccdd71ff573efcc3f2ff SHA-1: a671633b29542148bbbea8f2c259e39581f99fed SHA-256: 56a35e821352f6d5a850d9e1386ed0d6d7fa646c6ccb30df4c2eab1f91d8d8d0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://medvor.ru/uplcv?utm_term=fundamental+methods+of+mathematical+economics+by+alpha+c+chiang+pdf PDF link annotation
    • https://foundryindia.org/userfiles/file/81625977357.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/85f3548d2ff47754dfc7d30c97ef19df/pokudufuganuwavodadajaf.pdfIn PDF document text
    • http://davcpundri.com/css/file/95049057008.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/duwezelosura.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/21852670301.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/xoretejumutid.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8e6b834b0---goribopepo.pdfIn PDF document text
    • http://jtylek.pl/Upload/file/78930511651.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f2d30cce---59459348831.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/62696053719.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/26969669078.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/11452891792.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5800192230---14039123749.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eac2eefbd---gapexazutokomuduzafuril.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7d698ae6612f460a1e34676b63f667bd/93788177406.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c11305d4088---lolozotukurevolu.pdfIn PDF document text
    • http://www.centralperdana.com/file/14147123925.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/zisaxiwisiri.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/88962924999.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/76432077690.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/lukavanogemuxefeza.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/ladateninowekigoxokode.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/fae913a6e92c736e1bbdae3c2db257b5/lirifavibosovekuporimoje.pdfIn PDF document text
    • https://produse-zilan.ro/files/33620361238.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF371 2036 bytes
SHA-256: 7b7534efc14e207e67d68b3cca0f0fb3f8c5c57e05c1cf97de9afa5d14c5ad97
font_02_sfnt_off0000fca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA3 17248 bytes
SHA-256: 3d83867e41a0847d62b2cb96639b8ad7a70937ddd88b3ce8df321e57f1ca2243
font_03_sfnt_off000128ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CE 11296 bytes
SHA-256: acc0331c4fff56562f6dcbe351f514f2d1a835bbee6752ee869b5ce8c6425e32

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