Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b2f9197a4963c5…

MALICIOUS

PDF

80.5 KB Created: 2021-09-17 19:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f79754b5ed16a91cb82d57991d0aa051 SHA-1: f1e512c4b992b643ab0e8b1f39b6060573e235d6 SHA-256: 06b2f9197a4963c53783116d372924c3c0256b40aab785ae17a0b9a540f32d3f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://coretry.ru/uplcv?utm_term=emojis+for+harry+potter PDF link annotation
    • http://nsk-nalogov.net/upload/files/xamiwazegesozalage.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/nezamemezatenu.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/24804332421.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16142fa90d0122---57220470904.pdfIn PDF document text
    • http://aquatherm-graz.at/files/54419221775.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/28995207480.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/40012550579.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/tositovipovaneluzogotu.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/gutopejikopegarikagikug.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wonopuzotasubido.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210917223021.pdfIn PDF document text
    • http://ing-ka.com/user_img/file/42033712762.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/53294090333.pdfIn PDF document text
    • http://kingtonkatsu.com/uploads/files/41731087729.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/74945736633.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/nodumolavapag.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/ritisorotudedokolipogewup.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137381063ada---81205141689.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/wiwezoruxo.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/jonagake.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/29552528665.pdfIn PDF document text
    • http://abbeytraining.net/userfiles/file/rilevudugujukukupegowuwa.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/93446456974.pdfIn PDF document text
    • http://dreamwith.gni.kr/ckupload/files/vulaxesotetovumaw.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/69257566522.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ea6s38l7hlrjmk6lnbijmd74hn/72566484895.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_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 10700 bytes
SHA-256: e7ad557d017cf1c0dbe018076b3d2bf9a91b910b28ad1f0ee5179ec47ade2d5d
font_01_sfnt_off0000f03a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF03A 17160 bytes
SHA-256: ce8ef1b6a7f1f82598c8e3bd09b1203138272ba87caaf0df152cbacc16de3e7e
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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