Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d79bdbda69cc20b…

MALICIOUS

PDF

83.5 KB Created: 2021-06-29 08:07:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6473e5deb41bfbd9d553a42c86329b51 SHA-1: f380841ab203f77a1193339002db48343ce4566e SHA-256: 7d79bdbda69cc20bff4807c14222d8a46fc2fa741384acd0d3aa766f1f0315da
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or phishing lures. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/034tcs81blal0bdbh14al4k74r/gelima.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/f153da09c56fe61d1eb7cbbabb36da08/gevagalelojumamis.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/rapidatasulebemugodan.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/79530aecbee9d274811012be970c8d45/lubemaxukiw.pdf
    • https://cvsc.co/userfiles/file/runaziwuso.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b3977970b8a---zijejuvizododevube.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a943a32796---7652070526.pdf
    • http://stressmanagement-karriere.de/userfiles/file/82745324943.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3bb02a865---71039257849.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4123528a0ebdac954071d2eb89a36331/wipinanakirakemuxo.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b5dc0720ca9---xawijelezekoretagenu.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160747506670ee---85768555932.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f6a42a9fef45c0018c095a41b0f63533/2017253037.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/c88325612c3bb84c70d5f7bedd397e28/baxazijidekewa.pdf
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/vn9g37oosaflm7k0m4o0lebjmc/12637552284.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b646f0424---24925482704.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/935eda58e77bfbb3c22ed6049ee32c6b/kekobunulesumeperatov.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/e313570252b2044a0543dd03227e14cc/8842088993.pdf
    • http://chingyi.tw/userfiles/files/wolememe.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d798fdc8fc291fbbc0b33b17f5862fa5/77116741708.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73eeca0ef5---zamutep.pdf
    • http://www.emailposte.com/pictures/forunipapuvubatitesilo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=add+next+line+in+excel+cell
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e4.bin
ceae34ef6352b58027a85c4430deae9fd36c50b3b4b8b4924a9e1046a159e93c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E4 9896 bytes
font_01_sfnt_off0000facf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFACF 16792 bytes
font_02_sfnt_off000112e1.bin
6e940544a3c568843943aa9fd2b913e5151908273b6adeb1ed937f01a4f72616
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E1 17812 bytes