Malicious PDF — malware analysis report

Static analysis result for SHA-256 30256fd3d406ac51…

MALICIOUS

PDF

78.0 KB Created: 2021-09-20 03:30:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ce61dc4dd575793f380bfa1ad1111469 SHA-1: 48b4440cac050f9e9df32bef59fbf36dece9ee22 SHA-256: 30256fd3d406ac51a4f51435788c98012df66973c00d9779909818adb861e3da
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress uploads and disposable hosting, indicating a link farm designed to redirect users. The document body is unreadable, but the heuristics strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://jrpst.pl/userfiles/file/piwufiladupamomixexamifu.pdf In PDF document text
    • http://advocaatindex.nl/images/uploads/jixolulopaviselape.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/begaragitofim.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/wasabate.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1514c07a8---29624028662.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/diputedidabururedupejujum.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/21764796601.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/162f46f7206829852ae2bbc73e2a6b9f/10491951105.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/fenifibagudugose.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/3493014348.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/73430717417.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/bizawekoxepoberasesegoxid.pdfIn PDF document text
    • http://ex2010.com/uploadfile/file/2021091522104273499.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/kewixumofuk.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/d830b02e273a6e729a8efe6c04d2e979/zawifidupiza.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613751fc02894---lofoxijifapivegakobavi.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/zamejojusutazim.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1bc5b7681---ravujuvewinopukubemaziti.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/49164225991.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/sunijabiruwapexakag.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132e36755b84---33620829296.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/37472112118.pdfIn PDF document text
    • http://chinese-wall.tw/upload/files/vobika.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2cff3a568---zidogutim.pdfIn PDF document text
    • https://spvi.cn/filespath/files/20210915215236.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/57069713737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=dumpster+recycle+binPDF 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_off0000cec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC6 17028 bytes
SHA-256: 583eca2bb48d4f0ade894a871c6411e99afaca36270418fc6368fb25f1474d3e
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F1 10608 bytes
SHA-256: a039e2fb89d6b8d8c9807a8a32cdc0b81049d2a3330cd95cb49af2ea3e32a3af

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