Malicious PDF — malware analysis report

Static analysis result for SHA-256 e087882ad5ecd234…

MALICIOUS

PDF

83.6 KB Created: 2021-09-03 18:27:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e8a4c41a7787eb2562f2a50f355683fb SHA-1: 9395cfca14594815318ea55a2a1755e0ae88e37e SHA-256: e087882ad5ecd234fd8bd3656793537ec6621e93d1fec680a257153871be1ee7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no executable scripts were found, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content, likely a phishing page or a further stage payload.

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 https://cardion.dk/gfx/fckimages/file/woduzipikekov.pdf In PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1612bf28874cf5---nabemi.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3f6dd3e13c---vibipenavofibubidotovom.pdfIn PDF document text
    • https://www.nvsrolko.org/ckfinder/userfiles/files/kevaputipo.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/58959474876.pdfIn PDF document text
    • http://dtpokebar.com/uploads/files/89746104124.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/19788600209.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/tuwoluli.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8b99f8760ea6efde55526d1d428bdf15/dovep.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/91707371802.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/cc38799228577bcb0726068066ab32cb/basizoran.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/6cutgaui6jvknpi9cugehed8i2/58171401195.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f95107226d---ribugemuxadariwun.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/sipadox.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/8920527686.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/4f1ab4395c235a4014115d5219745523/66348160162.pdfIn PDF document text
    • https://activepymes.com/pub/file/39587488328.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/a7981a7efb986c9152afbdb9fac25509/9639681177.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160999ff4ef684---mifajakipebivutupek.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/nanajatisidulufaluwuroki.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/82945677791.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2f7341e15---39155615100.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161273ceef31b7---jujotimugewukekolu.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/97974601501.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=hill+cipher+algorithm+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_off0000df14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF14 10784 bytes
SHA-256: 559badba1177575710e40d4d5b044904846c18312a9f6c6e9394afcc74733540
font_01_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 18732 bytes
SHA-256: 591238c0d2fc6ff70a51cd330c4756ef395fac3d5867fd0fe6e2bcf1d531db01
font_02_sfnt_off000128b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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