Malicious PDF — malware analysis report

Static analysis result for SHA-256 e64c9c0caef6413c…

MALICIOUS

PDF

72.7 KB Created: 2021-09-25 13:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 88d7b381330651d312d3bd2d1e7cadbe SHA-1: 717fda0323c1969566cb84a7236ff81f3bd755e9 SHA-256: e64c9c0caef6413c82a7e6e8a663a64bfc62794e641fc7869ee3a4e56d59a4a2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a trojanized payload. No scripts were extracted, but the presence of external links and the nature of the heuristics point towards a social engineering attack aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/pufazatad.pdf In PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161319e4395344---56263791241.pdfIn PDF document text
    • https://vanchuyensahara.com/site/files/17108946869.pdfIn PDF document text
    • http://hzbaoyan.com/images/upload/File/sizira.pdfIn PDF document text
    • http://prmakeup.com/Image/files/depapit.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/gonodamumaladifiwixalofi.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/mavogomawipeb.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b92077a1f---77607584934.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/5589955584.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/63383142897.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/benakefiwepadajivoraboves.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/pogemaluzajoz.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/xugugu.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/92715057769.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/kibubirepovada.pdfIn PDF document text
    • http://geoman.cz/data/file/14591561154.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/70964735913.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9ef693fca186b3310c0ee11cc1e71605/78052574450.pdfIn PDF document text
    • http://hongsung114.com/files/fckeditor/file/90937158312.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/wiwepujolidelev.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/28466771871.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/71463663710.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/48079725772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=vpn+private+download+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_off0000b56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56B 10432 bytes
SHA-256: c9366e5752c0808680c4f6702f84d3aeb05c6368e2e77aaccde8ed50d34620a7
font_01_sfnt_off0000cd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE545 19088 bytes
SHA-256: 8f94cef71b9fdc6664c4f321006f05663a5a63ae503863d321f279d072496fc0

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