Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd114378ec45f53…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 01:00:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 973deb622ae434aa3a8ee22f5e518852 SHA-1: ae0e3b4ea379c16b572e3296db4c18cee32559bd SHA-256: 4fd114378ec45f53822dfac46c1bb951016076a55d67509e74322458d145f924
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF used to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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 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://jshanwoo.com/ckfinder/userfiles/files/joputizel.pdf In PDF document text
    • http://weiken-rc.com/upload/files/subujewafalokozut.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/woporaw.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/57132633732.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///vuguti.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/koguzovoniwosakatuxodesu.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/77463686086.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/tulukobatilopozi.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/81932215498.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/52042800513.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/2812143357.pdfIn PDF document text
    • http://thriftstorewebsites.com/flash/thriftstorewebsites.com/file/remijogeninelupifisoparaf.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/596508101.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/3be1ee3ca28b3b974f9b0ec08b757576/nomigokenoguraxexeri.pdfIn PDF document text
    • http://888chji.com/userfiles/files/28077882400.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210904075051.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161301fb19f503---gitoxowuweralawofokoxapa.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/0a49c625cf9494e4ed95ab6adf1cf724/72530901946.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429068c69a0---vakobemo.pdfIn PDF document text
    • http://kdekdyjak.cz/data/samisafewokakobekalosag.pdfIn PDF document text
    • http://naphogacomposite.com/upload/files/vajakimomidanidagom.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/54374104343.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/90981798865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=dragon+ball+z+episodes+streamPDF 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_off0000d85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF075 10936 bytes
SHA-256: 03462810d71d9872a0a7c35f2c0a97c82f7af74b216ea013a4b33629db6ac8c0
font_02_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 17944 bytes
SHA-256: fb8b67a8353c7332ac11c217022b72b2921f783d8587d4d24cefe7b501c87373

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