Malicious PDF — malware analysis report

Static analysis result for SHA-256 d00f6756dc7f4521…

MALICIOUS

PDF

97.1 KB Created: 2021-08-23 12:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5f9bd1f7bedc49445963e3ab0b0f2e34 SHA-1: 373b6671f93a537a6ba2a45f2a462dd2a202b850 SHA-256: d00f6756dc7f4521ff7ae04062f5fdbda98ace8efedbf997b9a550b591d3c393
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_LOLBIN_RUN_COMMAND' also fired, indicating the presence of command execution tokens within the document text, further supporting a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9896

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://queure.ru/uplcv?utm_term=all+things+come+to+those+who+wait PDF link annotation
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/3b394617abb21956a26ebb7d437ad615/11227077215.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/86862862937.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/ragatukagamipujuw.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e44c7b692f9---82692868867.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/45096640921.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/nidamukulilirofiturum.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a93484e1c2---55770768124.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccc6daf442---buxuretufo.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832ddfdc177---zenopavi.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xatefemomemifametuv.pdfIn PDF document text
    • http://fruitvita.com/files/files/92845348334.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/95729814657.pdfIn PDF document text
    • http://lblussana.it/images/file/wimikulogofudip.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/pekidelipagosug.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/ccf7de4facbf9ee6b5f64b6dc00119aa/liratemelusoje.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/60551180730.pdfIn PDF document text
    • http://seritour.com/rsm/files/wuwunanak.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/85eapdnmg4do9p1sr2mtkk6k14/85611140118.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/pejovun.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/bd79de5226a5a42be4be28a6fb914dda/mipuzurezidite.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/17663352063.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/nusavejujuxajubi.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/0b75a344b9510d3330436e88368821a0/labam.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/6cmh2lo90efuk6jtcmdobfu577/86295460993.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7e886cbd611fc374d72f0962f93de6c2/19848335709.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/b88os2l70vl9v8h74c94vi8967/23586027931.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plIn macro / runtime command snippet
    • 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_off00011732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11732 10644 bytes
SHA-256: f24a1aee67dfbe988b8f64a33c7f48ef267ab23b29649e8c7ce3ce9721e005ad
font_01_sfnt_off00012f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F7C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001478e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478E 17392 bytes
SHA-256: ac6751583c9835119549144eb7654b3da8730c4cb0e1735876f0b5def31318b2

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