Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c4f813b8375f248…

MALICIOUS

PDF

68.9 KB Created: 2021-05-10 11:31:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: fa493e1bec73b10b66832f8130ff1ec7 SHA-1: 326a61ff37912c641d3b9f8a41ac754f890d9d17 SHA-256: 1c4f813b8375f24883d317c987c452e209c0134c662a062f7c1788ec2861fcc4
96 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple compromised WordPress upload directories, suggesting it's part of a campaign to distribute malicious files. The ML classifier strongly indicates maliciousness, and the presence of numerous URLs hosted on potentially disposable domains reinforces this assessment. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb053100c0---letidozujoluka.pdf In PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607505decd250---36869665033.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210507011044.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606f00cdb918b---raxakukokewupugimisituni.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c97f2f13a1---sabevubirixi.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607c768430401---52108709350.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/00e5fc957e2677f9fff8792c4b8559b0/238099641.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/f35834b0678799d3c44b0e2137f340c6/16809082243.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kg20ijloamtrobf4m4tt5deaei/bopivedidufiz.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/nedokidi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/2cdb56882f810ee492e51619b97427f8/rukojonepokolulosej.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16097ce276de2a---70543107876.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/e2d25e48ac5cee05cbc414a76fd26ddc/12075144289.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/33dba637cb51990bd2b736f61e3a6e4b/desuf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cisco+ccnp+study+guide+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD101 4992 bytes
SHA-256: 7b6d4892cd74f3dfed5aec4d29cbcebdcb4ce3e0994ec4e8516d4df58edb2e1b
font_01_sfnt_off0000e226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 10416 bytes
SHA-256: 3a972308b0126d8e06a14bdd85f438d3cf4f5a5ee6ed90549d3fedd23eb21831

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