Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b0245f43173e72…

MALICIOUS

PDF

74.8 KB Created: 2021-08-30 17:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6ccef030c53926fe9bc2a0cb9bec3bbf SHA-1: dfe1ceaeccec589b72dbb8703319167623f1aa62 SHA-256: 77b0245f43173e72c2bce9e73fb01e26560dab115e8e3669268bb747fa766ce0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as a phishing trojan by ClamAV and a machine learning classifier. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of embedded URLs and the 'Fake invoice / payment lure' heuristic further support its phishing nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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.
  • 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://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d3b1eb7ea---74098489331.pdf In PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/35c84c369d5e04fa86435801d9906ed6/67907583516.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f1a211c7ee0---tomobaguzelilamidobepoli.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b44354f35a3---33575119979.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/sivomuwote.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/1s303rsrv1kugrtrj57fc22763/40652779762.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5af0d3699---25250205693.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/773e78f6ce0fddf4a72ef2807032bc6f/9002844794.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/59834479677.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c41465065f1---57894680179.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/feworakagexagaresakebifex.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/46499558588.pdfIn PDF document text
    • http://www.tecnobor.com/ckfinder/userfiles/files/5642820500.pdfIn PDF document text
    • https://wita.lt/images/files/37372830957.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1b1aaeca5---58881497578.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9b25cae74---91241947461.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/wobevobuwefagamabuturiz.pdfIn PDF document text
    • http://hainfelderteich.at/tuganikarusinem.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7c7633f45b55dcd53e8c5e29f9cfc233/didojiwoxapizuzow.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/v5t4g3hdk90mlsk0psgtttv27m/banenilupir.pdfIn PDF document text
    • https://upbilbao.com/ckfinder/userfiles/files/wipewekitirokexeb.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/zoxeximesawexewis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=60+second+countdownPDF 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_off0000bfcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCD 17516 bytes
SHA-256: ef2a41ed2ae2357a35034e55d00e7679011a1feac42fc90943f5145efc310a6f
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 10340 bytes
SHA-256: 8d30f971aba843e57599130daed8fb3cffdacd1399eaa96f00e6b7bb0273e579

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