Malicious PDF — malware analysis report

Static analysis result for SHA-256 312368d3a8750a01…

MALICIOUS

PDF

91.7 KB Created: 2021-07-01 12:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: f58ac7d450d84ca107ca928ed666bcd4 SHA-1: 5a46d8c618c94571ed78f135e86cb5caffa15f73 SHA-256: 312368d3a8750a015719355a5d8352ad62ad7a35f8f4aae25114cdd07fcfe733
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which point to compromised WordPress sites and disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. The document's structure as a link farm suggests it's designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=the+tenses+in+english PDF link annotation
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/58fdda702865de8bb0344ca074e2566f/59526959150.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/8af8b1eb039d98ccd463b95742a5b900/taduwemodajejife.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/963da6c5c9ec4e36905cfbf8efcaac36/fijatusedexi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/3f4801ee117d24345d3d0840daf792ef/15959515343.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/05e3b8eb772c50462c5487d0258c2ccf/70666019475.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/mubigepafawipula.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/92127c570513b1a5fdea0b37a7b47529/jobigupodinebagigimokoki.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cb749fc90---kuwetak.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/fli6pvq5u0j77kr6u40ga01ct9/josurumawipetewodebikulaw.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/99c367ed47f260e05d223f382aa04ee6/dopogewemudave.pdfIn PDF document text
    • http://omg.su/upload/File/dejuzix.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/jaram.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a85be67443d---ranurumapatapekiz.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ada5bf03e---totadufarawazanubomagani.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16086a8f0c5843---18407858474.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/banejebutidedatupafopuduf.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160720b270c42f---8282116416.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/75978345637.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/nutumado.pdfIn PDF document text
    • http://beulahcooleycollection.com/clients/870349/File/bamumus.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_off0001078f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA5 9968 bytes
SHA-256: 4ccda6e0589ef5beac1b4101b60c7c4d811768cd0498949fa74cb00e09cccbe1
font_02_sfnt_off0001359a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1359A 16904 bytes
SHA-256: d0bf093940f548de24cd749df8bab0aa9253d31f7dde4748ca59c8da0dc3c648