Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c014393c798a529…

MALICIOUS

PDF

89.0 KB Created: 2021-07-19 09:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: cce6683da126eaf0d4a0a247e3e4aa17 SHA-1: 901abf5126c5d6bf12cf7a5db27b65f130626baf SHA-256: 5c014393c798a52900adf5b294d9d95b918f4ba1f7fbc292a4e4d83398010927
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://archimax.ch/dynamic-images/cms/file/kazosunarotetila.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c9cdf2686d874fd59cbc526ff9cffa94/rifijedumuxunogogadide.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/zizotuxumema.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/81676925623.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/3g7nanusv6hc2o8ba37ankkv7n/6168899312.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7430b6f49---xaxafudu.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gikavojut.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210528035109.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/da2e96ef900a6644ce5bb6af6a8f521d/78533040916.pdfIn PDF document text
    • http://ohsongpharm.com/ckfinder/userfiles/files/93001839792.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/331608a2bd6b8f321d79d7fdedefec0d/wukefolinipasebuxiveru.pdfIn PDF document text
    • https://aurorabersinar2.com/contents//files/dedorevuzawajo.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/mve745ouk74eavf584hkkl9j6c/newafixawodunowuvo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8a0945108---23290729724.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1448d23e74---buzabolibubojiwuzexujilux.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6ed456019---venadixoseva.pdfIn PDF document text
    • https://mihalex.by/files/files/tivowejojanofuwu.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/wutojorixujitoro.pdfIn PDF document text
    • http://rolfingnaples.com/clients/a/a5/a5422f62036d2d393d866963e902351c/File/xuxotenetezefaboz.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/ec328a5687fe86c9dac23df2b781b257.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/88935087073.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b045aee2d42---buxadis.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/mifavufunu.pdfIn PDF document text
    • https://campermagazine.tv/public/file/mevoremidajafe.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/22006738273.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/54907740532.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=normal+oxygen+level+in+bodyPDF 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_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 17108 bytes
SHA-256: 77aa8ea8733046b398195177dab8199972b937542dda6f7fde3fb093ff3d8004
font_01_sfnt_off00012662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12662 10724 bytes
SHA-256: 1aa41ac0507191523d66b5b0d89d6952007826046ad2a2ad61f48b522ee11752
font_02_sfnt_off00013ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1