Malicious PDF — malware analysis report

Static analysis result for SHA-256 db01cab1276ae611…

MALICIOUS

PDF

88.5 KB Created: 2021-09-01 01:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 65a85a085b818f8df8b9796231830256 SHA-1: 6857b3491a79317f802179e63e8a9a3e3c820195 SHA-256: db01cab1276ae6112118eee29ad356690eeaa2c86a710bcb2b22e7bd8e0496bf
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://vildmarksjagt.dk/userfiles/file/3870662010.pdf In PDF document text
    • http://archifolder.com/userfiles/files/84267198494.pdfIn PDF document text
    • https://nestuby.com/userfiles/file/toxagevopoleximosisev.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/5ba3c2b7ef701927d0fdfd7d29578f2c/ginozuzos.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa334154004---similigapo.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/91f3474889f6b1f1a51163605010a58f/87874813950.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/mi5lemdcam0svikkhom2vlu5s3/gomebofis.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/2c9b80703b800e98730c7a9586ea7fb8/42844130294.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc3f9ae9cf---41323945233.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/fimovigogezow.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/juxopedilojigetoweruvu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/77053666375.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/xujidabisubera.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/jepurulexa.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16092040be4b34---93176469917.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d57d1986e---81952303580.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/87941169919.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/deganuxupunup.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/3e2b74819c7220ea4f1f71a3da57dfa8/32654410936.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d29994d89---zomokorezax.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1317b0abf2---52192949412.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/bimov.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/pujebimetuxexagaj.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/48964787579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=dinner+recipes+for+twoPDF 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_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 17132 bytes
SHA-256: b0d7c42977137ce59f86ecae680f7c75b46542abc64ae737fd1c9dc39c1ef23e
font_01_sfnt_off00012391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA8 10352 bytes
SHA-256: 5d6e3b2021d773cde904b06eb7a361d92cf338801c3fc6c9a2dbe8ec5a3fc6dd