Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7947a35fb420b70…

MALICIOUS

PDF

84.2 KB Created: 2021-09-24 06:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ac470c682743a826334cc4505621851f SHA-1: 261cfe9a8025b6fcc664b325be3e1714ef16c80d SHA-256: a7947a35fb420b70d8e52bd9f12d4fabd247e301fcf6b448cb510b941aa38172
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. Heuristics indicate it's a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://siripanyalamphun.com/user_img/files/wewomowovimuki.pdf In PDF document text
    • http://polesprogettazioni.com/userfiles/files/rewof.pdfIn PDF document text
    • http://superbarter.sk/media/file/bujobipavemol.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/e4000637043388f9fce58ecf3bd025b3/40868090022.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/74144660104.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/wowegunositelegaxelazaxud.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/acb7feaaf418088b2094518143073fa9/gokeweraxol.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/86567562502.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/34477731257.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/31537495655.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/lamorisululatugebut.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/47242661967.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/soviviji.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/80412132328.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/52884980197.pdfIn PDF document text
    • http://wdnederland.nl/file/xenigagexipatemezagide.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/zatawap.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109122107586328.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dexuvelu.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/vutuwiz.pdfIn PDF document text
    • http://9262895.ru/ckfinder/userfiles/files/15398963858.pdfIn PDF document text
    • https://themis-lex.com/userfiles/files/3315173507.pdfIn PDF document text
    • http://nemochem.cn/upload/files/wawogemojafigarugiv.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/44af2c439db0beca77b324d41c57a72e/nigovulukavejaputurinof.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/2356e56efa7782a35a5fef18971a8eef/japevugulow.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/89846558327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=procreate+android+apk+downloadPDF 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_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 10520 bytes
SHA-256: fa1ce1bab3fa8d003c940b2e986cb955c0fdf767d14bac5c0dd05cf0d54fbcfc
font_01_sfnt_off0000f963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF963 18832 bytes
SHA-256: 27be3047a6de1c210ab3bfb27fda5264bfacb07399d98fa20e46bfe634ce7e28
font_02_sfnt_off00012ac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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