Malicious PDF — malware analysis report

Static analysis result for SHA-256 a482c14e182ba1dc…

MALICIOUS

PDF

65.8 KB Created: 2021-06-25 06:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7105bbb275dcfb858a9d8a9850b8f8f3 SHA-1: 02dbe8b515baa060cf0121c2fbedf980126504e3 SHA-256: a482c14e182ba1dc9a36ac9cd781ee044360fa308a48d1c956bdb8846c60da36
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malware. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/lalotuxodado.pdf In PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c12484b566---jebiperekifi.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/87108794563.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/3791663013.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/wexofuradomapava.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/daronadusutemagov.pdfIn PDF document text
    • http://coopmong.com/ckupload/files/4118464648.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/furokivatexasevowomelet.pdfIn PDF document text
    • http://jhferry.com/data/fckeditor/file/%5C/62635264313.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/06fc3243bf4f9c25da78e3900cd1b896/36926306319.pdfIn PDF document text
    • https://vestol.bg/files/file/66609503063.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d474b8579e---sazarowurizarixofega.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf99ebb93ce---lifofakumewokebibumogegi.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/79761199358.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3e7ffef7b2782fcaa5efb17ea295e9c3/51940617660.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=angry+birds+rio+hackPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC28E 5464 bytes
SHA-256: d470e96b6c987900123efdf14b3b8afb5d39a90ee8619877a2cbdd0cbbbb0096
font_01_sfnt_off0000d526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD526 10968 bytes
SHA-256: 949e87a60f7d3256ef0e7e754f5e6cf2d1d911bbf626c8f31d759466021f5ed4

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