Malicious PDF — malware analysis report

Static analysis result for SHA-256 62914725477d6808…

MALICIOUS

PDF

85.3 KB Created: 2021-09-19 23:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20ad2c2ae3315c7773f9ab165e9d04d3 SHA-1: e0124793dcd6415fdf02d6b5105f06ce56f596f2 SHA-256: 62914725477d6808fb21eec20d0aad8125fc9bcd994dea2f53671d882a3fa576
156 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that function as a link farm, directing users to potentially compromised WordPress sites or other disposable hosting. The primary purpose appears to be directing users to external malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://synerhu.ru/uplcv?utm_term=how+to+backup+data+from+locked+android+phone PDF link annotation
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/1fqijr66r1eb40s8p0baoni333/47918165254.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/nowerelo.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57860680797.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/9757947356.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/43981342190.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/97230045889.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/61015698483.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/93s2knslg3n34klke0mh1epp85/bugikuwijuxuwevanixo.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/53194051331.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/selufamenoxilow.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/maxopages.pdfIn PDF document text
    • http://plan.msu.ac.th/ckfinder/userfiles/files/19711655771.pdfIn PDF document text
    • http://dfanchem.com/upload/files/mubiz.pdfIn PDF document text
    • https://dispecom.com/cms_dispecom/sgi_userfiles/userfiles/files/nomamazijekew.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/sebupatusavuf.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff5c35b257---mefiwodesizidipavatuna.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/fobitapesuxilokejivivoju.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/boboganovonekaxebuf.pdfIn PDF document text
    • http://mosjob.ru/images/file/zoxilonerotiwoze.pdfIn PDF document text
    • https://mfdesign.hu/files/file/kesuresutorogukewe.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/jufudarogipiz.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/8995756619.pdfIn PDF document text
    • https://mediaskills.rs/files/gawikotazupadovilogi.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/xatevemosuduvudeterulezer.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/44902996937.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/tewerojepanixegopepate.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_off0000e7a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A9 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_01_sfnt_off000115c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE0 11124 bytes
SHA-256: ca911af766a31034633579ff49938e7643e96c1dbb11de93812e37e46e3b4939

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