Malicious PDF — malware analysis report

Static analysis result for SHA-256 f210c0f45ef95462…

MALICIOUS

PDF

134.5 KB Created: 2021-07-13 17:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dd12d1eb29bd1e2eded89e03a728f4e8 SHA-1: ef42bc0ecb8a82c38170de8efd471dd7368809e8 SHA-256: f210c0f45ef954626af2f1a92a071e49ff2c6553680f6c76ce1b3c5975e315f1
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and disposable domains. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://crewmak.ru/uplcv?utm_term=bow+and+scrape PDF link annotation
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/9hm6c1n56qcvcht93fbp3d48vs/mametezapijodag.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/547b5b689dd1d2f16d44b13c8f7cd2cf/rugajumoka.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/92b257de4c65be65f7210442e54088ec/21604721437.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b716cd80f---75178280510.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/27df93cc9566be13f883b5c7d4fd7dde/87263537732.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160acf997c3698---14417346637.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210530_772D3CDDC6F19C0F.pdfIn PDF document text
    • http://wskinbody.com/data/boardData/files/52952267456.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2d66ef6e3---vomuvugofatefonodeb.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/nomevivuwokijomevef.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b82949cd8a2---89283069508.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/7h0entp61rmsksne7527bitk9g/kavurigafuk.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847ef4c3f05---44972809263.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/b7fe6df28d63f9e176e822be7a3aa75a/16495979463.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607d55f4c3694---sokefiwaxebetub.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/murotixu.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021070906501780554.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5dac97e5---beraromoserapu.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/wujowuvesefuxufunefu.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/juq39c757im7hp7v0n2v021ql7/savofuwinorovarulituduf.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001877f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1877F 29872 bytes
SHA-256: 05213acb9677ec725fbaef853bae8934fd6d0e6d7c5722f4c2a59a3a4c795b4a
font_00_sfnt_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 9248 bytes
SHA-256: 51d42c5a5bee76b5c9ce11ba99540aeedc42ba13775d51e12c167e44c517ce87
font_01_sfnt_off000157a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBD 10408 bytes
SHA-256: 3de1549de14392df0b38bae6cb3839c59bc2cad2fc524e7e34affa36e2d25e48
font_04_sfnt_off0001c09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C09E 33092 bytes
SHA-256: 1348120d7cfccf4bf2f10abf3ba4f6c97510743d0a49b5957da764107df958a8

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