Malicious PDF — malware analysis report

Static analysis result for SHA-256 df82d8f137bca156…

MALICIOUS

PDF

83.9 KB Created: 2021-09-06 21:53:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2b9e4f5b235bfc382b7870088a640cc SHA-1: fa4d901e58e5fdf7ea43ab7d4d3f5115c70a23f3 SHA-256: df82d8f137bca156d92170226b2ee52aebea08de437699e89ab453ec0af71a77
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/56018962081.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611825d6dc87b---50012347562.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/file/26198169913.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/79004566135.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/833197eb3ac6f52b27e5859ccaba49eb/merazidegajavowizefawe.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be1102a765a---fopajofitibukupebabani.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc10933dcd---14599714235.pdfIn PDF document text
    • http://isgsrl.it/images/file/gukolomebasikufej.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021081606182273499.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/6217d4647a4840fd27de282d19ea2bca/supurodireteparemut.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fd2ab98c94246525da4a1247a797f9c2/satugomisaxasajabuke.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/hd6p2e1udjp40632uj6jefu97v/totujafojawutusogozap.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/23453371730.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/84500376024.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e1fcdf28e---laxazegetapas.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/93658cb25f22b4723a2309dbc934de8b/bivolejili.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/ladolipatimitisalebix.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/23317607877.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/6ccc618bc3384cfd0789610d599bd571/bokuziwifikedapusega.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/52088473400.pdfIn PDF document text
    • https://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a42d689c1---pibikititufisojabupuz.pdfIn PDF document text
    • http://chikatere.com/Upload/files/lesetinuxenunonezaporowib.pdfIn PDF document text
    • https://craft-personal.de/userfiles/file/43060286905.pdfIn PDF document text
    • https://cortemadera.com/wysiwygfiles/file/wadevijobuteruvefojin.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/35133714829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=vlookup+in+excel+2007+with+multiple+worksheetPDF 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_off0000ddf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 18472 bytes
SHA-256: 4775f4c69adbbf3da6110f0974ec118be15471034a8b4767d5c079a6b496e67c
font_02_sfnt_off000125cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125CC 11120 bytes
SHA-256: f4e02362013ec5f8768fed5284ac45b147acf062cfe090dfb50f76a854f44c69