Malicious PDF — malware analysis report

Static analysis result for SHA-256 0044b1de565cb272…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 15:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fc80f5e83bba2b3a2ffde50a17c342d9 SHA-1: c68bd11b58ddf0d2eaa922d231c0ba2614b3d5bd SHA-256: 0044b1de565cb27263f24aa0c8c5729e25da7483e67f6d8e7d986a2c823bcb06
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external PDFs, many hosted on compromised WordPress sites and disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download' button heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://ecohost.ru/pics/images/file/giripupow.pdf In PDF document text
    • http://bygreenpure.com/userfiles/file/xibejinun.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/bovegoralibodemo.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132387cbc116---29330347404.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/kenibasudifu.pdfIn PDF document text
    • https://thietkewebseo.com/webroot/img/files/65973831927.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a34cd1a8d---koguno.pdfIn PDF document text
    • http://acelybio.com/upload/files/linubuxitagefajok.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/77727627546.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/biname.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/zidojojoselokapuxugag.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/73515307980.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613173c874a07---77467797175.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/mk0vlibr0l4todsaq5mb3fc4h7/36009255324.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/29029518128.pdfPDF link annotation
    • http://lawyergz.net/uploadfile/files/23065406416.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16130fbd93c5f5---lobefatuwirojuwoki.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/kugobawodekejiroxufolud.pdfIn PDF document text
    • http://kleiberit.ru/files/file/61962206332.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/65441428889.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/61596587263.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/8556832366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=easy+frp+apkPDF 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_off0000d5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCB 18520 bytes
SHA-256: bbb341447aee8e972be3be2e717356fee01349cfbb7db4edaa2b4fb662336acb
font_02_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 9948 bytes
SHA-256: a5d81adc87b14c3a43a993e10c263f4d94b5e410fd1a2884cf0965fa6b456694

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