Malicious PDF — malware analysis report

Static analysis result for SHA-256 15850ec3e1bcc02e…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 08:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cd767e0269fdb6942cd20648b6f4594 SHA-1: dfb97c03dadfef11d635b575f3968a672ec54d69 SHA-256: 15850ec3e1bcc02eaf4586e5e9683a9c1347cc493a0aef528eb93e76523dd31f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials

The sample is identified as malicious by ClamAV and an ML classifier. The heuristic 'SE_MFA_LURE' strongly indicates a phishing attempt, specifically targeting multi-factor authentication or one-time codes. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF versions of web pages, aligning with a phishing lure. The presence of numerous URLs, many hosted on disposable domains or compromised CMS uploads, further supports a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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 http://madiran-cruduparadis.fr/ckfinder/userfiles/files/36043174537.pdf In PDF document text
    • http://dansungsala.com/uploads/files/19298717338.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134000a81f3b---zebotinusirukotuvinufam.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/diputizobodele.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/mivanufure.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413c2366322---limamataxixitozebadipafa.pdfIn PDF document text
    • http://kingsap.com/file_media/file_image/file/fopanoz.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/tuboma.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/89431865346.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/62496713992.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/pejemomuxetebo.pdfIn PDF document text
    • http://mq-water.net/upload/48082785693.pdfIn PDF document text
    • http://ledins.lv/cms/file/61708434277.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2f597682b---94307838407.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/71659725112.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/napasabesa.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/22529780927.pdfIn PDF document text
    • http://relindalouisylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lazenepuwe.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145bc634320d---woloseposuzesaxonejorub.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/73088101438.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/dawisezodujubur.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/28537828521.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/31911294572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=hack+discord+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_off0000ea67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA67 10172 bytes
SHA-256: 5d9bf68f3b5e0dd245e927f2b71941065f5e987c84997012bf7f6928bc5d06d5
font_01_sfnt_off0001013b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001194d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194D 20280 bytes
SHA-256: 934d1a910142d18347bd68cf2e0e6f31a3e55ea1b3b72afb5af732a45bacaaae

Open this report in the interactive analyzer, or submit your own file for analysis.