Malicious PDF — malware analysis report

Static analysis result for SHA-256 408c3627d2358ca5…

MALICIOUS

PDF

75.2 KB Created: 2021-09-17 20:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7ea2eea76d7f997d80770ae5d0bffcfe SHA-1: 0dcb829fa790c107c297381cbce2d0113642f447 SHA-256: 408c3627d2358ca5de7b039dd421d6e291ab4239199bd72a3848d54ef0309762
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many pointing to external PDF files hosted on various domains. Heuristics indicate this is a link farm, with some links pointing to compromised CMS uploads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://hanleyresources.com/images/weminasiva.pdf In PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/bulusupimabuwupatome.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/96777245111.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/wuxexemodelujipolavivuxul.pdfIn PDF document text
    • http://ip-malkov.ru/uploads/files/fivegonajijigag.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613226c5c69df---petagowoserofomatireg.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/25262658440.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161448835e9e68---nixidubowigeku.pdfIn PDF document text
    • http://www.trisad.kz/ckfinder/userfiles/files/59313388392.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161310e5e438d3---44433293401.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/gijabukevesavowevoti.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/takegasavawilojizupumuxej.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/e4gftdnq9nn0bk5c39o2am6ai3/31941231718.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/nuripexupowowifima.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc09ef368---97145724456.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/nujaxopuzejasobi.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/melatugukaj.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/59922059130.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/bilezebi.pdfIn PDF document text
    • http://gammatradings.com/userfiles/file/145561003.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/4b22145ad2636ac6903e92bf55017321/sejalatexidokusawoteni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=june%27s+journey+cracked+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_off0000c1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DE 10732 bytes
SHA-256: 4069fc19d94472f039602c8791ab21d00e344f4edc4f1bf9672522d1ad834193
font_01_sfnt_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 17680 bytes
SHA-256: 17f2b7dbeb5c67e49c3a1986b0a0a2d77d7d1422fdc710f580aca41b8588784f
font_02_sfnt_off000107e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1