Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc07a6172a6bc9a2…

MALICIOUS

PDF

113.4 KB Created: 2021-09-05 10:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d9a5681b5f4ba3fd0eba2aeeef42196a SHA-1: 8f41e4f3dc94ae91581fbad6ab5e792553f92c33 SHA-256: cc07a6172a6bc9a2de09f517e8772e877005200d48537f170cefeede84910c6a
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised CMS upload storage or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a link farm suggests an attempt to obscure the final malicious destination or to distribute payloads through multiple compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e4abb77fe---70304458561.pdf In PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/77626281627.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ee5d2b229f33718cf788140a687f4d28/pujilajijib.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/feterevesuwaderomap.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///70349277842.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/34306023870.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/gigikutewefuvakawobivafap.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/4096470467.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/90244199443.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/fewone.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/solodorimavifubuvik.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/pafufuzozeko.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160add7035140f---xagalazobudabibaguj.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/xepegagenukevagivirisexu.pdfIn PDF document text
    • http://innovad-ltd.com/userfiles/file/derisorinezotevu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/fa4c4eb0d1490acd6c0b118eb7405592/gomip.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cbada282e93---94871047376.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608183e88113d---potoxororib.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/fcb7bfb7bb30a9c4d10488b9471dba41/95923322112.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/832c7ce2b3048b5c49669167f3146853/63985737659.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/xutexokipawujatevibis.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fb2913ef5---32019748788.pdfIn PDF document text
    • http://synfarm.com/upload/files/pifekivudutofemad.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/natokufin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=mozambican+civil+war+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_off000154fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154FE 19288 bytes
SHA-256: 6adc6c04488b614436333ed9c183a19a7de4a7627e748e27f8fb5d8677f11b74
font_01_sfnt_off000186b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019ecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19ECD 10728 bytes
SHA-256: 4e0efc3054717671da0c2e1f483c6c9d1651f8d2a4495754b3f3732889a3d7fe

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