Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f842db9fd1d16d…

MALICIOUS

PDF

71.1 KB Created: 2021-09-25 08:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db280f5ae9bf2be02910f775e41f83ad SHA-1: 646b624230c70511f7cd61d5ad85ddce03c16a2f SHA-256: 01f842db9fd1d16d148c468591f3bdaf005bbfdcd64c2fbb40cdd770c3036f0c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The document body is unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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 https://mallorcaboom.com/res/wysiwyg/file/54874662317.pdf In PDF document text
    • http://gazosilikatnn.ru/uploads/files/5710795451.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/jumujiwexexibekedofudaduk.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/xunofezexowawanakuli.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/voduwepikekuwevarete.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210902_DF0B0E2ED335947E.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f7b8a112bb---11240816776.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/94960950360.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/39208818016.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/xinelukumejuvifofilo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/3fa2ce9d521fcf1ede60b9922218c934/rulerufojezolidakamulodud.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/71339169213.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161303162b7930---25029334350.pdfIn PDF document text
    • http://bbfrontedelmare.com/userfiles/files/95409433299.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/wudiwefefusajulototexiz.pdfIn PDF document text
    • https://tessuno.com/upload/files/613690a48362e.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/95485783908.pdfIn PDF document text
    • http://hzyixiangchem.com/upload/files/torasugosipaxevatebu.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/75722735346.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/zitasexubenupaxu.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/63531059007.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/madufetijoxejovejesape.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/64755072408.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/59554931872.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161378e5f89af6---repaguwaverawazoleb.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161465f7086e12---77752252797.pdfIn PDF document text
    • https://myshalewell.com/userfiles/file/90794701630.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/fesirezizategebafofek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=mk+2+moviePDF 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_off0000b8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A2 9864 bytes
SHA-256: 36ff05c314c514c0c1ac81e9b0e3ec961d58e16e5cef28c043584c05042b835e
font_01_sfnt_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 15804 bytes
SHA-256: ecc24ce6cf24ba1081fc67af43608630c863997bd59b5c8cd137dae84157d494

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