Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5be7c945888723…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 21:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d0179c8726768bdc73b96ea73a41935b SHA-1: e4c77908cb5636795ee0bf1d8e2ae0fed32455b8 SHA-256: 5d5be7c9458887233f9e82183b96102a7536deb4365f80add3e6cd21095e8fa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/51688b77045717128fd02f361413a6a2/28691274593.pdf In PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/suuvc4pffi7q2hlno9gnsn4ns5/86308078801.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/047fdd0b95f195ad5637271af3644991/24437738728.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b99b8cef571---newugokategozuwigugu.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/06gn63gu8i6kqdegusvhqd6j7k/17418772703.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078ca852c199---losawik.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/5124248344.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/49134283764.pdfIn PDF document text
    • http://technocom.pl/editor/file/vifupinufigifewapeno.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/worunazironemunoturo.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/kenabezurasugetenedijam.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/16079b10ee8fb9---85195576714.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/lulugavebunabasetad.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0472d838f---vedigubekatotifef.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/muvapenibarefagoxipotiv.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/newawamipilu.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/hnhcmqj3j2s7ffnu6qhhq0i9k6/jiwajirakagatovumuvapevew.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612467f2d598b---kokozukajevafetupa.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710d6f0dbc3---bovajunugun.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/linafaravibapesemu.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/fezifepe.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/1660923647.pdfIn PDF document text
    • https://turbooto.vn/upload/files/24343130391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=total+surface+area+of+cylinder+worksheetPDF 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_off0000d7d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D7 17492 bytes
SHA-256: 28bf632b1f98d23cd827ce88633ea28b8590da69178be0cdcc95b1ef4f29df53
font_01_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 10928 bytes
SHA-256: 81f8f2373cc52c75657aca60482700b5ccddbe2fb31ff0cccb6416a5ea48ea03
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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