Malicious PDF — malware analysis report

Static analysis result for SHA-256 381eb0f8c327178e…

MALICIOUS

PDF

77.2 KB Created: 2021-09-02 13:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7a49e8e78fd7a2a83f419a9b91ec6fad SHA-1: 21b929be619694130c1abff9da23399843ba20d2 SHA-256: 381eb0f8c327178e749c34332a4dc19f258fa1b8a45a02620506b4cb9154b2b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57c2481eb8---jemebu.pdf In PDF document text
    • https://rpaxis.net/userfiles/file/47208431487.pdfIn PDF document text
    • https://mimpiindah168.com/contents/files/gamimu.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608667f5b8f3c---tefufisowizidisatitexut.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/mikepesirinojavidagebixez.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/padisumuxezamip.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/tonebowigera.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/c9b95051112c5d8cfdeaa90814503273/leram.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/d5fc57323e68fbae8eaf8fc6a5eb0610/23333695368.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/52819718741.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/4149671666.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/mafukovejaralomuna.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091bedbb83c6---37635648828.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/16gst164m5crusj0ag7cma87rj/wavubolopetozunefigibev.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/30527a485cfc6047d648c4391e75ef95/tuwivupabasidelakep.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/2n29l7on41q5ghubqlligrut51/64781097.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086a41fef296---rukomuve.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608164a3713fd---rejogajipavu.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/bf5140fb22e9db6d3d42805867a54a4f/tomugimisazivirit.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/obkhr94l6uo9iq73vkcqv2vd7e/tasikuvixopapogavobar.pdfIn PDF document text
    • https://lemanssrl.it/file/ginipabisavajetun.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/47819453921.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=uscar+21+revision+3+pdfPDF 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_off0000cbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBCC 10888 bytes
SHA-256: 8e0372d1ddfe20fec708a6f1d33f9998b7192c5ab101052c70d983dd9faf4d89
font_01_sfnt_off0000e538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 16204 bytes
SHA-256: 772d536594b91be5f543c99d282a9abb6b5d7b4175b4634cff3b28744d00617d
font_02_sfnt_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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