Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe778d6187dcea6e…

MALICIOUS

PDF

91.7 KB Created: 2021-09-07 03:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3cb3d1788f14fc2d8be2d96c961fae77 SHA-1: c84dd57ba927f898c179f397ef9055650ea6c66f SHA-256: fe778d6187dcea6e1d982cf65bb5abb36c5160021f2843270cccca4cbeaf6609
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. This suggests a phishing or redirection scheme, likely intended to lead users to malicious content or further stages of an attack. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084adfeeab01---zadulezexuwuwobero.pdf In PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/v0il9td05a5ueva8bmjlspi7o3/junumepususase.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a001795a62a---27334761122.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/64373889776.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/35352691868.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/zerifanekisug.pdfIn PDF document text
    • http://everettsbarbque.com/clients/b/b0/b0b566c85bab127526a414587b81487f/File/5603214530.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6da2f14e5---wevutumo.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/lowijurakesog.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/lalikapo.pdfIn PDF document text
    • http://print-resource.co.uk/ckfinder/userfiles/files/nonukozaxofowigamonozumag.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611902708aa46---58985578380.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/91030214849.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/34359467449.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612cada5ecc3e---ximadiwuwupetup.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/952cc755c6e952a253df49e94be24799/44130516945.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/49396784815.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613477aa76af4---41053770958.pdfIn PDF document text
    • https://p87.hu/files/ganenaxawuna.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/a879797a0b3b97962def938fdd78b7fa/lixekewipe.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160913f3807e8b---63258253421.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/sizomerizabupa.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/67024699171.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/7bbc9ca20797fe3b7794b3338b8cf42c/32555184729.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=mistral+tower+fan+manualPDF 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_off0000f34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34C 23136 bytes
SHA-256: e6230ffbf145ddc35bcd039805e300483d076185c64884d5986932cf7d85a209
font_01_sfnt_off000130bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000148d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D3 10556 bytes
SHA-256: 9e1ca42775d62cc99eafd800ded2da8ca355c70353000fe86366d4f7c18613a6

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