Malicious PDF — malware analysis report

Static analysis result for SHA-256 59f1b4ead6de5dce…

MALICIOUS

PDF

91.0 KB Created: 2021-09-06 13:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ed0a7fb1eed2c90f9c919688309731e SHA-1: 75edfccd6c47cbc7d59c8c0e2b8c39ca6e347225 SHA-256: 59f1b4ead6de5dce27c7e9581ae1399267b9aaec4e4ddaf40e6e9bfbe11c3d1c
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. The heuristics reveal it functions as a link farm, hosting numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://queure.ru/uplcv?utm_term=longman+academic+writing+series+2+pdf PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/47ec17de77470ef84c51aec8b119f264/xedozorilel.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/81phs46i8igg1j65gtfjvdmv12/87747362227.pdfIn PDF document text
    • http://re-view.online/fckFiles/file/rerixixu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/59e1b4adf429169a4b4d43ef17d7d6fd/19123376642.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160a71b031af7d---86209919517.pdfIn PDF document text
    • http://tulga.ru/editor/files/kewogagulogikidonuwemub.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/17832582439.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16088a2e33b46f---vemimalepoforetusux.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/17152065317.pdfIn PDF document text
    • https://best-label.com/upload/files/10680309248.pdfIn PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/zakebiraped.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16098996a312a1---65434426926.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/161343622d3bad---95158404200.pdfIn PDF document text
    • http://ournextfamilyreunion.com/clients/4/49/491fb30de6d8464ca6518fa43aba5bd5/File/luwujegobodiviwofor.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d023d8881---wodazojafokux.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/geduretesen.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/13738277489.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/49513611962.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/d285fatl6avemc5rhid0o6rloh/17500181577.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/98525921111.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/lumarekefotewupufawija.pdfIn PDF document text
    • https://satbietthu.com/luutru/files/dizojumixojo.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf54033be34---rarugo.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb658e5877---95430267216.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_off0000fc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC42 18444 bytes
SHA-256: 0ec42e6a961fd8a599efeace9f20f790b20d77522a6b774b670765e0b38572f9
font_01_sfnt_off00012c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3F 11080 bytes
SHA-256: 5924fa3d121bf5c3cddc0e3bc477ab89d81248ba9523a6f5ed9f1012ebdef278
font_02_sfnt_off00014605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14605 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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