Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8d14a16fd51ebbf…

MALICIOUS

PDF

73.8 KB Created: 2021-09-05 16:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 73d5b00eda20ea2c1bd3e067ded4cf63 SHA-1: 8a9e139026490963589aebf10198abfd7033b10b SHA-256: d8d14a16fd51ebbf192ff9b21b98c086b25105d6cd33aeca7a81f1070182574d
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to distribute further malware or phishing content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://radio-salsa.fr/php/rs/filesupload/file/4593392675.pdf In PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/052571928df2e5d22d2a567aea4dc974/nakokejivamet.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707f9549f57---xivurosafilujuge.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a048572e350---51567892479.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62dbab252---90864531355.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160781737e9247---21108122184.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c31efcda189---nemekif.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bea8e720d85---30973271063.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/rovufexilovaxi.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/pufemunabadafebuvutasugim.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/cc416b54db53cf5fb0e104861aeaca75/56470075795.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/07d6495af1640841480b8d6e48cba3bd/katuzojawodevaromo.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c21917f3497---62940723458.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/56281197185.pdfIn PDF document text
    • http://ketoanantamhcm.com/uploads/files/mawizafad.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/14510960819.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/lebik.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/tokuxewegusakikoxem.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/kenedunugabikenaf.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/nibanonij.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/508a467536face8483d62f4a6c53e28b/vawas.pdfIn PDF document text
    • https://tivicom.vn/upload/files/zobofukuxunu.pdfIn PDF document text
    • https://codecs.ro/images/file/97085703182.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=uu+no+13+thn+2003+tentang+ketenagakerjaan+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
stream_003_off0000bca5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBCA5 16532 bytes
SHA-256: 83403104ed930d3b04440f8c04b9f97f6b9aa948ea49089691dfce2eb8cd7330
font_01_sfnt_off0000e6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CE 11264 bytes
SHA-256: 55da47b69e033ca9b0fd8ae68b7f96b20b9579b3770e3f504e800173aa408bdf
font_02_sfnt_off00010121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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