Malicious PDF — malware analysis report

Static analysis result for SHA-256 856c0553df324713…

MALICIOUS

PDF

80.5 KB Created: 2021-09-02 03:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 162701082d7640eecf4afb89377ec8d8 SHA-1: e8c3167a875d4a17f06751ace3f91ac33c7a7322 SHA-256: 856c0553df324713a64f134bcc5a95deb926c041c31f190784546a6d16600734
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/35c14n9e2jvpiusugtfg9ksbns/44554004372.pdf In PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/wiwevudoxavivokosowewoso.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/baronufugovijasekida.pdfIn PDF document text
    • https://beysukonaklari.com/ckfinder/userfiles/files/dikelumefowitifumaved.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/82900854759.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/cc46718a991f8b4938cfafe44442579b/bekafagurimoraxo.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/vt7if7743jp6ieqrqu41rmkvg8/danonuxemolir.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f6de91b443cd8ef2184027d57b8fdc6f/83281346476.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/e10470a90ca85c944f78fb6085a40a6a/ruxemiwibatabekixedakabe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160743da05bba6---22565316436.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/46750794308.pdfIn PDF document text
    • https://panelshock.com/userfiles/file/boxazubalelonos.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/31021947116.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/28392710348.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/21be4466393fd21493686f59aeb151e3/88620464044.pdfIn PDF document text
    • http://westleyden72reunion.com/clients/4/46/469dc9162705cbff2d1fbe132f144f37/File/81740168415.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/ruberefapaxodutax.pdfIn PDF document text
    • https://sokolzgierz.pl/web/uploads/files/tederomupubuzedejopomo.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16102dd9f06735---42154139336.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/nosomuxemegudu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c99bac62---dosireganiz.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/wobotasidor.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d14c12682---38928418041.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=numerology+5+compatibilityPDF 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_off0000d699.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD699 17424 bytes
SHA-256: ddc92dbde87774b000d815ac849388a4cee45a9678723aa8d9940eba503f127c
font_01_sfnt_off0001034f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1034F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B66 10912 bytes
SHA-256: ac41cb454878861e5a279ddedcfeab19a993f5f9d0586c370d160a795a1b5960

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