Malicious PDF — malware analysis report

Static analysis result for SHA-256 5691ade94feb9b96…

MALICIOUS

PDF

93.1 KB Created: 2021-07-18 18:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c20e26ed9cb3f5b529308973b212083d SHA-1: 4c34e52b47ca4718d37760a68e5b7c7b0020f6c3 SHA-256: 5691ade94feb9b9662a60fc9b349d911c224720f497d04797de49cb237bad888
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains an embedded JavaScript stream and a link farm pointing to compromised WordPress upload directories, suggesting it is designed to redirect users to malicious sites. The presence of JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a224367c7de---dowuzowigeliponova.pdf In PDF document text
    • https://manuscripthandler.com/userfiles/file/59655039216.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/35025897050.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/zebevolepitabofatideromil.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/dudabolarikonuwo.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160af7f538b22b---sagudilitumefezenereleku.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/p7th7rcf1ppv85s2bmk0lhi0nr/54877868527.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/11547644675.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/rodurinelomimunukoda.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/2e20e7d42ca67711d42c144455cfbfcc/laduv.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/zugipelarelefive.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac96dca80bf---zuzonuwak.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608caf537e2be---31880019303.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a7ed56894---65100223183.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/galukidagi.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/9989601129.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/25344006223.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e892c8cae---44428723368.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/18308c1421d3b70a99e72066b177e6c0/87321619119.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cdd92b353e4---nogimofilutimiborisukerim.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9048b3639---16590613449.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/7f0ca30f8a2733e885c638cde263394b/54782660413.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/lapoxu.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/24477604712.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982be770d98---46583654178.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/xurodon.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/sqth0m1siod419fokdn00jenm6/povivedasarivurodok.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac805b29c8d---soxit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=young+looney+tunesPDF 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_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 10128 bytes
SHA-256: d97c2b1b578b0ae3e5948bdcb50317adace61137b77ca0121922924ae31d73cd
font_01_sfnt_off00011de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE7 19212 bytes
SHA-256: d7a0e76ec349730f41e5f6bf28c448b21a3a102fac6de12d631fddc0407fa589
font_02_sfnt_off00014edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1