Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf31bcc98687aff…

MALICIOUS

PDF

80.5 KB Created: 2021-09-06 21:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0c0b38c283ccea4be3fb31c1413012a SHA-1: 08a0f43775daa180a3c16b66f19eb21b7505eb77 SHA-256: baf31bcc98687affee8bdacf84d1e39d3014d79269ec28d081a05e3e6f6fcacd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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://connect-senior.ch/uploades/userfiles/file/bebezik.pdf In PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/zopobotawolejav.pdfIn PDF document text
    • http://adveotec.com/img/file/jazemosorugagaveve.pdfIn PDF document text
    • http://siroyensao.com/upload/files/20183977568.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/119e108af552176e8282831d3fac8236/458207314.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zufexedogu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/974bbdac908e67dd2c49fe633f7f538d/gabapasoguvo.pdfIn PDF document text
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/fademomobimezataxux.pdfIn PDF document text
    • http://geriatriccarenewjersey.com/userfiles/files/52010782891.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606eba8a73481---73564938343.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/16613030719.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/96974396344.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/xigavonasuworavusot.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fba94d998---dinemowulizome.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/87938925848.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a98473366---fobapawosidilixuvosilemiz.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/06f88d341542fd824b29acada9d179b6/34919883154.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/gawadogerogebatipevoti.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/48532390879.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b159d0b3106---niwuxivutepixexan.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1263acd5c---vumimojilozafa.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607deb6d3ce60---14246376879.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/xeduko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=spoken+english+for+engineers+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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 16784 bytes
SHA-256: f797a65b8ba86c9282dc8c94c06d03ba146ccc668d84f0ab0fe9cbbfd39ce298
font_01_sfnt_off0001046b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C82 10684 bytes
SHA-256: 4b3459fe92e216f81763f731aa80dc2d426fd60605e4d7d342e10e98fb94bf14

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