Malicious PDF — malware analysis report

Static analysis result for SHA-256 146a8377718acc06…

MALICIOUS

PDF

82.2 KB Created: 2021-06-15 19:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 19e916c465f9927316ad80ceee5933fd SHA-1: 2abc74b6515ea9450d91e7e9ef7c815ae37e95f8 SHA-256: 146a8377718acc06678405f17f4c4e892c5ecaab971eae8eb53deace8d1bf799
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms. The document body, though heavily obfuscated, suggests a lure related to 'Pokemon activity sheets'. The presence of embedded URLs and the ML classifier's high confidence indicate a malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://laborke.ru/uplcv?utm_term=pokemon+activity+sheets+to+print PDF link annotation
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/085e8966aee5462520bf9a4f88cebcf7/kinebekiwuzogim.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/20232063559.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/177t0paffv604h6vb4cc9k0efv/zakagaguw.pdfIn PDF document text
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/n3nk9eguh6ch1n5hmp6pijt18p/zutexetugudavolugubiw.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/e4c247edd2ffa3809622880db98e1d98/71323664059.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/74b8752c8bc3cd633800b01e1686889d/55263730532.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072331c1b292---kiperomotukifanefapazuji.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1802004c---36924087047.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160844e6f1066e---wefofitovedi.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/81744498209.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210610_182049.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/5874ef4e841859916b4a5c2faa1ec078/lazurixonimeje.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/1059698796.pdfIn PDF document text
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/pubebobodaxoxelu.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160a597a3250c3---vinozevajipewifebepawa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FC 5368 bytes
SHA-256: 7baabceca064603a20ca9eb00c098f500a8e1fc1152f295e6307542d4bb4ec8e
font_01_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 11196 bytes
SHA-256: ebf5c883695eb02cdac9b00e951b0aa89ea5b5cef823f13dfccd5e79f5346b38

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