Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c5fe75866fb1cc…

MALICIOUS

PDF

76.0 KB Created: 2021-10-01 05:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 83b15d5b5f8c1edd4c8e173e326319ce SHA-1: 2c141af2d58ecbc70a98583f5309114bfa87e7f0 SHA-256: f8c5fe75866fb1ccc7f6a5fdcffce852fcf0c8be24cb0dd902756fb36cb19a9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF format and heuristic firings suggest potential for embedded malicious content or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://palcev.ru/userfiles/file/lebatolug.pdf In PDF document text
    • http://pbhdom.eu/userfiles/file/31093094072.pdfIn PDF document text
    • https://bursac.net/userfiles/file/bubazavuposebaxew.pdfIn PDF document text
    • http://exosushi.com/uploads/files/78844820602.pdfIn PDF document text
    • https://migger.dk/userimages/file/kibemudatilimosewepe.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/51065418998.pdfIn PDF document text
    • http://chinazzjx.com/d/files/tekatufanezagikukepudija.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161534b33ab079---12102827188.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/tuvijosanunex.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pigigibisimatizuzopo.pdfIn PDF document text
    • http://goldia.cz/data/file/28244881782.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613595b9c1467---73248039816.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/24157557846.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161400ab26b45e---60046982281.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/61961724903.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/94970660587.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/ff8bc4cba80d2db85908b751cbc519c2/85503842811.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/37928504429.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/depexugeguzibakokele.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/13018935901.pdfIn PDF document text
    • http://gyliver.ru/files/files/matipi.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/24620927568.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9ioihmgg9vm4k8rulkf60v0p8l/9916304466.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/18683532314.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=xiaomi+broken+screen+data+recoveryPDF 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_off0000bef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF9 10904 bytes
SHA-256: 905932b1ccd0e5cddedbc8b4d624a5acf1e33fa17fbf209dee3dfdf9d02a0e35
font_01_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 19076 bytes
SHA-256: 1f6a6f8c42279793c36271ede6fa327b9a2ba9e7cb430a311f7db31e15f6ee98
font_02_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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