Malicious PDF — malware analysis report

Static analysis result for SHA-256 db84542907f81fb2…

MALICIOUS

PDF

77.9 KB Created: 2021-09-17 06:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3dfb436b242a20cf119d005e817259c SHA-1: 9b50713f2694ecbf8c1dc8904f8e2b9a7dbf7447 SHA-256: db84542907f81fb21950b02a9debd0e7d44b97e15fe9d3911a9ae7ea8d0b2b0b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as containing links to potentially malicious content, including compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external links suggest a phishing or spam campaign designed to lure users to external sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://oniceh.ru/uplcv?utm_term=satan+yehuda+berg+pdf PDF link annotation
    • http://kxqcgs.net/filespath/files/20210907173537.pdfIn PDF document text
    • http://www.lbtfilm.com/uploads/files/8268341935.pdfIn PDF document text
    • https://voyageaventurenepal.com/upload/files/xosijedezanalugu.pdfIn PDF document text
    • http://agrocare.hu/ckfinder/userfiles/files/zurisisasuju.pdfIn PDF document text
    • http://vejwun.cz/images/nutugefafonew.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/soloboravopumexi.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/88567323148.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/2638509844.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/90352455675.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/bisesedixuvube.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b215e4a4---60615733293.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/pegazelorofowireti.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/55669449110.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/15715563114.pdfIn PDF document text
    • http://runwellconsulting.eu/file/file/94385799167.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140512558b1f---getudaginevuja.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/52549135135.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/78237876269.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109111013309666.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/sozibafur.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/10932736173.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4e8263eef---puledarurawuzudamabux.pdfIn PDF document text
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/64098231722.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/pasanojowaguf.pdfIn PDF document text
    • https://kiptep.ru/file/76492259608.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_off0000ca6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA6A 18216 bytes
SHA-256: 51b1024d83becaee40dc24fdc2d642823ead8dfd521147187b6cd0714bccc5eb
font_01_sfnt_off0000f94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94E 10780 bytes
SHA-256: 31617821a741be1b7a82a4dc86e8b8e49695fe6147f6fd77ece613d7dc9cc4bc
font_02_sfnt_off000111aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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