Malicious PDF — malware analysis report

Static analysis result for SHA-256 83821ac79a865227…

MALICIOUS

PDF

84.5 KB Created: 2021-09-04 18:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 50f133b91cbaae7672ffbccf9e710c04 SHA-1: e71c3f074011bd6a4f37ebd678f184c743d0bb5a SHA-256: 83821ac79a8652274b360e3547f5f6ae7d21bd6add46201439d6f7964b965f70
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall detection by security tools points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ngocvietbungalow.com/upload/files/kegosilerutavadusefin.pdf In PDF document text
    • https://securityguardsupply.net/php/uploads/file/53175504841.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/17094804009.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/fodevefozowe.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16072bfdb5626a---kupesevaxire.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/vupodejujowamakegusit.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/07fe2eee783d9f698d3e76f78f7514e0/xivamimazikufag.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/zademeniwisonagamuxed.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/12801496330.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6cb27cc141b0a599d382e0ac33711fa2/20263066992.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b575edb1e56---wewamokekujavitulizuwom.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8a8f42a49e94652e9f85f16559c5bba6/85454859568.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/kuwujomuzatowofa.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/kideralamijimisaxowen.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/56745694511.pdfIn PDF document text
    • https://network-italia.com/file/firapawididodukukofetu.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/sepiri.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/6689524485.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c235046f145---42178272973.pdfIn PDF document text
    • https://mar3ol.com/Files/files/99781039787.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=hellboy+ii+the+art+of+the+movie+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_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 17660 bytes
SHA-256: 74d0d03f61aa043a227be6d0a7b80b158edfc8b08a2af5322c72089225ed4669
font_01_sfnt_off00011417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11417 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2E 10804 bytes
SHA-256: 185775caeb41df5673ce788bae4d576b013c153fc80f19d4603717d1cfb353bd

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