Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8875b084a20337f…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 11:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e429c4b8bf9334f88a57a5c5acca719c SHA-1: 86bd8e5a5de43172e25819cd2cd0b185f52004ec SHA-256: d8875b084a20337f5d27391695ec1ab7c1d4b20082e317366b4abb2dc04a263d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to malicious or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

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 http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1610f3067469e1---valabovavekezubox.pdf In PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/d2b041d29899a465c082968b89c1d86e/padezazigavinesezazo.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f989cca6c2e---24622998457.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/43038558265.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a20340105df---13050950665.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/pafazivatutenavitewaxapo.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/uhadm3qdmakv3vikra41njf2ha/69367757383.pdfIn PDF document text
    • http://somersetcountybar.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fekirifepetavaneberelu.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183a13b94a0---kovopurukimakes.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/3110582687.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/dakolipovik.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/80092777187.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xumafapuxo.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/796b6efd501515f38466e5db78f97834/81771566281.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9de69ebb6---voxawat.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/mipunofasabutemuwiwaperi.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/giwenevudedoluselo.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/54158990190.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc55a818515---rinojudozudutonaz.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160908535323d6---wufokimujapov.pdfIn PDF document text
    • https://mcsfood.com/images/file/goponomanuwo.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/jojizafesavivevikavuka.pdfIn PDF document text
    • https://ready4use.ru/uploads/files/fenabofad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=phases+of+the+moon+worksheet+year+5PDF 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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 10768 bytes
SHA-256: ce1dc2df508356ce39b41efc0226a79cb3789be1a500b1f09e01fa51f50a4c8f
font_01_sfnt_off0000f7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E2 17476 bytes
SHA-256: 1be8d4b76274bbf2da3b0158f98689d4107aa06a035ecbb2374899701c79a20d
font_02_sfnt_off00012550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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