Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97dcbaf337473a4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-05 01:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fd952f7b758452c8c8146f0d09cc0864 SHA-1: e368b5e583c0b779174ad483210ba79a9f315c24 SHA-256: c97dcbaf337473a49374f854f2fb43e03b8195347ca600446525e7b94b793600
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The embedded URLs, while numerous, are the primary indicators of this phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://draftingfloorplan.com/ckfinder/userfiles/files/dopegi.pdf In PDF document text
    • http://kppzp.pl/userfiles/file/8945042641.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/folatipiwuzawani.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/julubifexak.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/99068575958.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/bikedisunizul.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/zawif.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a61d43762a6---gofuxezes.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/togofazupejatemik.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/24543365384.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nedofobazopenujom.pdfIn PDF document text
    • http://aromata.ru/upload/files/75913020850.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/2ce941ac8738a7887e4c355ef4aea3e9/94805246850.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fda9a8fd82---kixubipazulutepata.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/66113463936.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/76ngh9otroqcv0engen0429mi6/basinotan.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/38171030309.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/dp81gofmidr0b0sh1qn9gqr9v7/wetamipalunopotowawebeka.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/bebalenepenow.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/574a2dc9ef34a13200ad6934c9593779/90951818599.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/44323238465.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d9c360724---18908157311.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160df3ba97512d---60594031456.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=protectionism+and+free+trade+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_off0000bbcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBCF 10736 bytes
SHA-256: 8494905a0233dda76e7529bca312d0dba921341b069fd96afdd5d879fdd174b8
font_01_sfnt_off0000d476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 15920 bytes
SHA-256: 166dbd16dfc1a925fb77e5ecb1d59297a799f7bfe9b432a8ddf93f827febca13
font_02_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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