Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10712c4e1409fb9…

MALICIOUS

PDF

88.5 KB Created: 2021-08-13 17:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 75dc3337d0a99cc2da40190de97f60e1 SHA-1: 00ac3ed0f17c93a8af5ee4566b381972a6142496 SHA-256: c10712c4e1409fb9f64dcbe6771a5fd4e023eb98477a4b2c8b31d8a94e28ed83
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and a link farm pointing to compromised WordPress upload directories and other domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are then used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 8

  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://tl-systems.hu/files/files/57979800314.pdf In PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ed06e5de54f---refugirav.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/2cf95415919a26c6e01106537f97b88e/sopoxomu.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/61876796773.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/wikugeninelamelitorot.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/85598697082.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/55366909451.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/iiiqop3ugd2gros7v25mmj7ra2/33166370224.pdfIn PDF document text
    • http://candientuvibra.com/images/file/fujidu.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/50480812089.pdfIn PDF document text
    • https://digireg.cz/upload/6762707262.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/sewozapavasupojafixi.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf40c2c47e4---36269023577.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/nesosonomapirarirunajeto.pdfIn PDF document text
    • https://papiratisk.cz/soubory/37426056552.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/2105090147038513918t05j9.pdfIn PDF document text
    • http://turnyras.lt/Files/file/xifisopugadiduzi.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707c0f8f63c---95318341148.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d7084e65633---8344146552.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/43212792730.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cf07cc16737---jokaxujisunid.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/28034271272.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/48600463428.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/60506880680.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/22493403916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=eu+fico+loko+filme+netflixPDF 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_off0000f119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF119 19824 bytes
SHA-256: a6ba34c7627cad67ac031ada8d4b92aa4de1ee0e734bedb30fde14a6880de95d
font_01_sfnt_off000122eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B02 10344 bytes
SHA-256: c9507c519199b02424ea236ccebb49c871177549949e5afda83592f03f0bbaa6