Malicious PDF — malware analysis report

Static analysis result for SHA-256 23272fcfb6f8880b…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 14:07:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 93c07590fc038d6d0ef6d4f2459c73c8 SHA-1: c1fe101fae20b21f9eab1b2e5affb167443bfd46 SHA-256: 23272fcfb6f8880b6405b22278e6db687d9f154954f38ed363957bc4c88d0fbe
164 Risk Score

Malware Insights

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

The file is a PDF that contains numerous links to external resources, many of which are hosted on compromised CMS platforms or disposable domains. The presence of a 'download button' heuristic, combined with the ML classifier and ClamAV detection, strongly suggests a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall pattern indicates it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://nomylo.ru/uplcv?utm_term=daily+report+format+in+excel+pdf PDF link annotation
    • http://wmc21.com/ckupload/files/rutosebevukulo.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/domeluxisid.pdfIn PDF document text
    • https://immobilgold.com/file/vinejowix.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/vosowonatazotetug.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca37a3325e---lulewopalumig.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/zikozavupapadosegejipa.pdfIn PDF document text
    • https://eitmedu.in/ckfinder/userfiles/files/99142227841.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/memevaluvotir.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2b8769592a94455d267d323e9be7e944/fodifenimofemabefuxabo.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/lujupodaki.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/2ab198fce691abbcfd1bec33ea3f351f/82307003989.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/7d20394ad088790996cda24463b48607/48061131442.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/339bf3494e3ac44c5ddaa589a6aaf0ad/befuxinapomuda.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/90785783513.pdfIn PDF document text
    • https://ehbo-oostkapelle.nl/userfiles/file/55907962616.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/banulasobevujubibupevo.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/tubokepizomini.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/kikubamimasivegogeja.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160883aca3b30d---togazesusazibazesejak.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/64821524049.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611ca0359de5d---65269831391.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/94173916740.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8fd47a154a---64266324156.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/223f07b58d4051b4006d009156905519/64213077799.pdfIn PDF document text
    • 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_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 16412 bytes
SHA-256: 2f56596f8369da728675812e2c86f352b6ba36c5fc9cc8e1f33ef6736e43f999
font_01_sfnt_off0000fde6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115FD 10832 bytes
SHA-256: ba57aec63f377db8fa9892fbecd5fce84c4abf94625898d7bfbc8781e696f108

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