Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6509cfb2b644c28…

MALICIOUS

PDF

82.0 KB Created: 2021-09-24 00:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3a0470e4282c96fe28e71c1dd90746d6 SHA-1: bad2f9cb1c6d13599bc3e8c06642272facbb1653 SHA-256: d6509cfb2b644c28fbab1d66f241d875df08a2890cfe71f5106520305a5dba3f
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm and a lure for browser extension installation. While no scripts were directly extracted, the presence of numerous URLs, some hosted on compromised CMS platforms, suggests an attempt to redirect users to malicious sites. The document's structure and heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://chroscina.com/userfiles/file/fajukisitepalakejiko.pdf In PDF document text
    • http://qcfloor.com/userfiles/file/ropezubolifawesifekediw.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f075fceb24---73018305253.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/a12cc834ca2b2ef599833967a5ee16e7/14444612717.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/jenasino.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/35191294471.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/perunajenebepoxogav.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/lozikikat.pdfIn PDF document text
    • http://holzbau-napetschnig.at/nilujita.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/dezezigu.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/luselenetosoxuno.pdfIn PDF document text
    • http://thelonerangerfanclub.com/ckfinder/userfiles/files/rumuwefij.pdfIn PDF document text
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/70595923704.pdfIn PDF document text
    • http://skalamatbaa.com/userfiles/file/13082560216.pdfIn PDF document text
    • https://motiwalainstitutes.org/userfiles/file/felejezi.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/dibimosidekuxafezidopul.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/verosazatutapevira.pdfIn PDF document text
    • https://pchome.uzai.ca/upload/files/rosatazebusegow.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/witedafunikaxugi.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/vajemojakowusapofirowumir.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/80379248040.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/filexawotitudixuvax.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/96120623575.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/88rcasgq4e31fl33l07rttgoo0/xigezubafisi.pdfIn PDF document text
    • http://fohow77.ru/upload/file/dijuminodogugarajelu.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gukama.pdfIn PDF document text
    • http://air-con.ru/upload/files/kufetize.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=proxy+for+1337+xtPDF 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_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 17640 bytes
SHA-256: 93209bce45b38c6a4e3024ae17c92150d2e481a67cdf4518d9e557c292d17ce4
font_01_sfnt_off00010c6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12480 9996 bytes
SHA-256: f056178a5bcf24c40040bd18cc0e0ec04e5a2de080e26491799dc3608c386792

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