Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1a9472afa97e66…

MALICIOUS

PDF

70.5 KB Created: 2021-09-30 12:05:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 16f9010eb75a7c4f95299826187d5c15 SHA-1: c9374e19c4d7a503976769cc729d3a49b6939edc SHA-256: be1a9472afa97e667df1e0aa19be4abca3f46725e4b0bf5f74135680afc27e2b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. The numerous URLs extracted, many pointing to compromised or disposable hosting, form a link farm likely intended to redirect the user to a phishing site or to download a secondary payload. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://abpjse.news-read.com/upload/files/noberukezavojubejawixo.pdf In PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161556f96ad2c6---12358217627.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/7148035697.pdfIn PDF document text
    • https://anjingliar.com/contents/files/topedu.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109121251102130.pdfIn PDF document text
    • https://airxps.com/userfiles/files/wefadiwedavaji.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/kapanamalazofeb.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210911110622452737immji8.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/zixebowujizasipa.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/xunowusoluledatodojuni.pdfIn PDF document text
    • http://anm-av.de/uploads/files/jilinaj.pdfIn PDF document text
    • http://juentai.com/userfiles/files/budosofefenajarunegejaxo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d120f2c22c---jegabovefurovomilosi.pdfIn PDF document text
    • http://lindendirect.com/ckfinder/userfiles/files/fuwitowofupexepijifage.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/70066753840.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-7/20210907201331512131.pdfIn PDF document text
    • https://granitnet.hu/editor_up/worimakero.pdfIn PDF document text
    • https://zlataraburmevuckovic.com/files/71183721949.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210907172219.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161348549bb022---97368598482.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/79552831283.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/bezolofubivovuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=farming+simulator+19+game+download+for+androidPDF 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_off0000b005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB005 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 17136 bytes
SHA-256: a7b16103ed524d934a59c777b1a3a43bf90ba63e485dac0384b2393b99e3dbc5
font_02_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 11080 bytes
SHA-256: 12800e8ad4dba2e818ad2630efa18bd6a91aa66f07efe5bdf34f42380957b737

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