Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4c640c9ee7de1b…

MALICIOUS

PDF

88.9 KB Created: 2021-07-24 16:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 567d3cf1fff7c4d3a0d370a4200b2e2c SHA-1: 259235226be29bbd66da2bfca8c7a0df4876e9da SHA-256: ca4c640c9ee7de1bf99cc5559df13243a2ed0768330ada6bb4e5f7ae0fde6f53
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5b057c8b2---lanoxidanedoval.pdf In PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b83102f14---sosilom.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021621620337821.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/givigagub.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/27515947823.pdfIn PDF document text
    • http://envigest.cz/upload/file/60767266863.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/55830076656.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/87707141055.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/jfbo1mo7pk7b148ghsajcoaie1/zovetajamoju.pdfIn PDF document text
    • http://nhs1980alumni.com/clients/878257/File/xutupulipavoniwevifa.pdfIn PDF document text
    • http://shukokai-voves.fr/userfiles/file/wusidatekukafizaneri.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099bbd669b92---luselifelazopa.pdfIn PDF document text
    • https://parkettworld.com/upload/files/59147111824.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608030ebdd54f---4084704426.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/71aeb570430a5ad7fec97e8c54d24622/tasebowabexexitegurewaxuw.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/xulesuzu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ae7bc032e---71242800844.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ntj12oi1hstdbdj892urtu8vn3/tafupupak.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fa2e5a2b8---kakowuxejizaxigawo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/lipujaduxoluxarex.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/takujugupisevaferunede.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/zurexolipakak.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/50243794140.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/27369543885.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16096ae629fbba---bemije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=the+jungle+excerpt+questionsPDF 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_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 10932 bytes
SHA-256: 7375d83dc56187f9b0abebc7b4fdce36ab35841426a04848b09c5ef1abc3de87
font_01_sfnt_off000110dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EF 16552 bytes
SHA-256: 55591b1652c119693e78430273478d2b4d17dec77c012d66eed9cc99728f0ecb

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