Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c4c9fc3731f41e…

MALICIOUS

PDF

86.8 KB Created: 2021-07-07 11:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 02c252bad252d27553ceff0e24ad2d84 SHA-1: 93733d1a3b395023a4d20a29c93348507246d3b6 SHA-256: 99c4c9fc3731f41e285d94b5ffdc81439780f3a4a19df6ff0700372ae35169d8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it's a link farm on compromised WordPress sites. The embedded URLs point to disposable domains and compromised CMS upload storage, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://smidgel.ru/uplcv?utm_term=discrete+vs+continuous+worksheet+answer+key PDF link annotation
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b71a8093---29506090003.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/bisubefibirofakibov.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/lerilonekodonax.pdfIn PDF document text
    • https://nusbetaja2.com/contents//files/83142588042.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5mcevmbiufcrj3adukgagm0qj6/rinamutodovepozapelo.pdfIn PDF document text
    • http://apsons.eu/files/file/61599943011.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adec8e7d7ca---kufematapimivofew.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/85dbuotarghpv5jc3dulq09t37/bujoze.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/19168759617.pdfIn PDF document text
    • https://autoroman-service.ro/imagini_ws/31329837378.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/wifakibiwuwigujen.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160cd4761190b8---wiwetonere.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076bd090946f---77971671840.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ad00635f7---zonemabitokimizanovuvube.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/0e77cb82bc742cf53eea4fef2b388af3/54559913119.pdfIn PDF document text
    • http://tele-video.ru/upload/files/83309337749.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/senuwitagijogixesazikig.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c56ba1d28---50711271186.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/ximagakazidabidopa.pdfIn PDF document text
    • http://onellenorzes.com/uploads/files/xunelumumumasuxixezadaved.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bc56669a6---toliwalafizagixeg.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/kmqqgjhs1ok9o0ppq318i25ki2/1249213615.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_off0000f11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10936 10740 bytes
SHA-256: afe93576b1a1bb871a46c905557963c269d5f87b5b2710b3662643f9dcf00271
font_02_sfnt_off000121fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121FD 16828 bytes
SHA-256: f7edb801654c3b8f251ec4006e6b24466538b98d1e4d67270f3d0de37f50faa2

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