Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d01a23f92eade3…

MALICIOUS

PDF

75.6 KB Created: 2021-09-15 17:29:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3fdfd4e0db3da4421d9d0adc89be8aad SHA-1: 4c005afbf23a5c583611988134d48ec27e773641 SHA-256: 11d01a23f92eade3a79c28334c04f67c8e1621e08e17b055beb30d51c7244eec
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of numerous URLs suggests an attempt to direct users to external sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=sniper+3d+mod+diamond+apk PDF link annotation
    • http://tnshoppingbag.com/upfiles/file/60656838773.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/44067408278.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/xisimedo.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/22880744832.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b25063588a---2524164055.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/44739970625.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/sebibutagu.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/965d5a653acd2c090252a9e4f14799b2/65100471556.pdfIn PDF document text
    • https://www.gurgy.net/ckfinder/userfiles/files/19591950939.pdfIn PDF document text
    • http://juncheng.tw/upload/files/81972975488.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/90514240935.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/53dd4ea68db2463181ca829421fa1e42/77459471579.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/62724771332.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/44271017548.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/pupalerusutekibupigil.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/poluzired.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/zipevanixikerenadepunaso.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/96324435026.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613352ce726af---619194814.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/pisoxov.pdfIn PDF document text
    • http://hanauhrova.cz/files/79603645316.pdfIn PDF document text
    • https://priscar.com/documents/files/zibudiboxekazuzizotore.pdfIn 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://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_off0000bad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD9 21052 bytes
SHA-256: 952276a0075a6d93cae6731da9703edf3de7ab78e78ea5a190f816ce101b9ce4
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10580 bytes
SHA-256: d3f64f7160eb1b1f2974471dbb55d289532d030b494650cd3b47ff7065e9b00f
font_02_sfnt_off00010944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1