Malicious PDF — malware analysis report

Static analysis result for SHA-256 4483ba16b2c76a8d…

MALICIOUS

PDF

96.1 KB Created: 2021-08-23 13:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: fe2abfde61d4075a7b0be52cdd2f5bdb SHA-1: e6919831250a5859cf7026548d07b99fcfeea613 SHA-256: 4483ba16b2c76a8d3a89985e4e4f5abd9ab271de5a80bef3b0e960426f7f599e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of external URIs and a link farm structure strongly suggests this PDF is intended as a lure, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

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://armagedonspedycja.pl/files/file/17635651359.pdf In PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/gso45cr24446vn5k7a0pfh35g6/59463345163.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e471918f1---tuvatovadu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c3854ee1513---ligabazepenozo.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/957dad1fb104421f09c5cbcfbb85750a/62831681594.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e10f0927f---30345286574.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/loriro.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210624_210500.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/perirokodaxufesimawoput.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/33527443408.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/desivibanemufumura.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/f72ee49a106e294e0853a31e1ccfbd28/vajufelodaganesobojuj.pdfIn PDF document text
    • http://szpk.hu/_user/file/291075129.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/d58f96613b5550e7898b0f9a323622be/43399103394.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b24a105f05---94027961009.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/45932283180.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/727da0c4bd1b0604583de3ce5a8f43ff/rakutesudo.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/bejawom.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/68835036611.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/7a3734ad8c3ade13b2315363cd4293cc/navojaberazikodexo.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/726d58fbf9be526095761234d0ce9dca/sanopikanitanixamajober.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/62593201736.pdfIn PDF document text
    • http://www.celso.org/download/tikonujagerutu.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c991786669b---zelesipinev.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a39b4d3eecd4e329f6f8c5f00c1a2587/40796541778.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711a1c058a8---ruxinolivojasoluxumeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=biology+study+material+for+neet+pdf+downloadPDF link annotation
    • 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_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 11196 bytes
SHA-256: a4ba5b8f29ab70d2ec86cb23d1a3995e1868e5e26ec64312c6de3a62d990c216
font_01_sfnt_off00012cd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E6 16780 bytes
SHA-256: 8a01cb2c383d861db4d141fede7faae2df49bd76714a41220541541e642cf948