Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8506196a5acf775…

MALICIOUS

PDF

93.7 KB Created: 2021-07-27 01:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7fe0955c3d86603f71c2507177effc91 SHA-1: cf6cf6d23413d204954976d28bcd17a261efc651 SHA-256: b8506196a5acf77591e2a1cd66e2e95378c5e65fca1f3d31e4ca7e2a37bde694
184 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating an attempt to redirect the user to malicious content. The heuristic firings suggest this PDF is part of a link farm strategy, likely designed to host or distribute further malicious payloads. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.aqsclimited.com/EditorImages/file/25422151848.pdf In PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096190faae9d---dopex.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/2937384765.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/cl6gebtdu283797qi9j2migc26/84313586954.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e014a07d5---dojibuwowog.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/76632978744.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/nozuwanutanugor.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/58135199411.pdfIn PDF document text
    • http://alfadent-volg.ru/images_uploads/files/lajenuxivavukenimuli.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba6462d569---sorijaz.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b25ae76d880---xoxajaxedifupogemu.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/97206450139.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/39689561116.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/ccf85b3d0871fef5f865b4559069b1a3/popasadonajedakaz.pdfIn PDF document text
    • http://usmleworkout.com/files/file/zajorajukijafamunawo.pdfIn PDF document text
    • http://tbm-mova.by/images_from_html_editor/file/53124958581.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/vosazebovi.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/74041280026.pdfIn PDF document text
    • http://iviltra.lt/images/files/wazodebeseb.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/um4ovgbprb1kd5u68qeolpjq2l/dunivurumaxa.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/75535162091.pdfPDF link annotation
    • https://airbays.com/userfiles/file/83451596340.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/bulitofigimu.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/guzadejudodij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=amelie+musical+script+pdfPDF 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_off000105e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E9 18360 bytes
SHA-256: 5fff316660f2b37b43259c071db44943ff3481a09ebba336fb02d9b51cc816f1
font_01_sfnt_off000135f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E07 10640 bytes
SHA-256: 5e38c0b49a9194ca22900fbbc80840b8f2965d0767933f64be61a929188b8b43