Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfb53fb2afd8417…

MALICIOUS

PDF

90.5 KB Created: 2021-09-03 08:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 50136bdc86dab164dd0a174a4daa9143 SHA-1: 892a85c9b3e2ca4aeeac13a2d8b5f4f17feef1d8 SHA-256: ecfb53fb2afd84179aaf92b0992d06bdb2c6bde70f8ca972d90463cc29766f2a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2bacbb9130---denirot.pdf In PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/e51f24984c915c199701bac35305e9ea/4161533537.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210619081737.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/3310154220.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/k889hv44u2it4mdns1phlb3t93/4824660291.pdfIn PDF document text
    • http://aristosaigonhotel.com/uploads/files/xinifixa.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/tizoj.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/labifujar.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/vufedamirukoretujosi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de71c32048a---regujafigesiwa.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/1685757067.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4b464700e---45205352216.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f4bab3d88---vizebawaxulidorugoj.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bdec0976062---gakosar.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/bapululilekubo.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/45798587925.pdfIn PDF document text
    • http://vividconcept.in/userfiles/file/226552888.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/5ba1acttmo9off3s8bo53h2ap1/62218191244.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/zanisobejekofikurabupe.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e957996ca5a---35874992375.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850f753e69c---35100681864.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/giloxowalive.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/sapazavomelepemo.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/xusovadavapivebuse.pdfIn PDF document text
    • https://tidaksusah.com/contents//files/77211042838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=receiving+the+gift+of+the+holy+spirit+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6a4843b570e00691a5095582c61952ed/wusuza.pdfIn PDF document text
    • 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_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 19808 bytes
SHA-256: ce8d5f5a535626514562079b6cc04c7342280ef5fddf10a8cc6edd2bd539c9b7
font_01_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 10960 bytes
SHA-256: 1a6f94960b76404bf8f0ea1caefdf842d09da524b78fba5c03a9bb1f0a2988cf
font_02_sfnt_off000143e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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