Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66843190976ee66…

MALICIOUS

PDF

84.7 KB Created: 2021-07-26 02:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 44d86fd30c1d3a5aa2b758c5aba5453c SHA-1: cc50aa788e3160971bdf077028d84879e2429b0d SHA-256: b66843190976ee6675736050c7bdfd1f0fdd471198286a5e2a4b0a2bafcb91e4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it's a lure for invoices or payments, and also suggests a password-protected archive handoff. Multiple URLs are present, some hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://msinziniering.com/userfiles/file/gesepuzisetar.pdf In PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/29587861879.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/zavokulurajodovotedovowar.pdfIn PDF document text
    • http://exosushi.com/uploads/files/61840105942.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/37d760d964a01588ea8242d8a2db41d2/bosuvib.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/26845997788.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/maliwudabiba.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7852becc324fd168f11323eed490862e/daligugusipumiwadapi.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/widajipitegemelepox.pdfIn PDF document text
    • http://qa-whg.net/upload/files/50347620359.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/wameseban.pdfIn PDF document text
    • http://greenbiotech.vn/uploads/userfiles/file/satimujedogiro.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/fe070c8d373518af405a61dfc01cfb16/nonudafijiweb.pdfIn PDF document text
    • http://guoyangmoju.com/userfiles/files/gavaz.pdfIn PDF document text
    • http://1960whs.com/clients/7/73/73384dfd0d582a2861cf356c55c3c578/File/najumozewulab.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/46621121715.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/mafuwasiduvoxagovative.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b097665838---13471318610.pdfIn PDF document text
    • http://burfel.ru/upfiles/files/poruvuk.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/b87ce5ff366195527186cfb01b3dd663/17704765808.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cuenta+dish+movil+gratisPDF 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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 10892 bytes
SHA-256: d32cfdd06e698547cad584084e5a6bbce1494014f4a3934a6900e9fea6a1483e
font_02_sfnt_off000115e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E2 18348 bytes
SHA-256: e256cb1db9653e285bf328cfe11c774378012138b716e2c39891bfa13069224a

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