Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5fad0f5e7ff33c5…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 22:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fbf00ba76c30ea0339243b8f8808a362 SHA-1: ea00c5d97a9b8395bd8ebc59d5f7fbfecef8bcb6 SHA-256: d5fad0f5e7ff33c514eb6e8f95675d8c0eff2e641d1db23662e04a3494dede93
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs suggest the primary attack vector is directing users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/bupevubozepiliwa.pdf In PDF document text
    • http://naturabliskociebie.pl/userfiles/file/4587787751.pdfIn PDF document text
    • http://signauction.net/userfiles/file/tunupaduvofebomapegowumi.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/1127224512.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098510a4c6a3---89226040718.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/e0963a301a6bd3d4800589e1aa0b6172/21303626008.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/04kd6nua16i4j4dtu8t9aonnuk/jixoki.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160702d4326fe6---tadimalipagibesife.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210608043137.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/68966708762.pdfIn PDF document text
    • http://jingyitech.com/uploadfile/52373005615.pdfIn PDF document text
    • https://susta.vn/userfiles/file/48306668584.pdfIn PDF document text
    • http://hondaotohaiphong.vn/upload/files/62859216949.pdfIn PDF document text
    • http://hanleyresources.com/images/66487848251.pdfIn PDF document text
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/f3f81ccd9d5417e13da7a92b7b7d1f40/85015113665.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/85427640353.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/kuzoladujovuxexekujovel.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/vatugalikoz.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1607f493b25a06---bolufadigekokaputapim.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/28093330234.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/82ag25f3fkpvjhvrl0p07nqqoo/vabukizurobejime.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/16353746147.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f34134c637689c71b50cb8b0ad8e517d/fuvetadozeginiw.pdfIn PDF document text
    • https://migger.dk/userimages/file/69953617224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=lucky+lucky+lucky+me+sheet+music+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_off0000df6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 10660 bytes
SHA-256: f174647bd323c5b44a1b3679d7411fce5410e80c1ddbdb8ac1d4db5c5541eafd
font_02_sfnt_off00010ffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFB 17220 bytes
SHA-256: a7bfecdcf6821244b9b7d5fdcfef38dfbc1b0d6357e1d808cc6e8d1322b188cf

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