Malicious PDF — malware analysis report

Static analysis result for SHA-256 4eccba44ef750454…

MALICIOUS

PDF

87.4 KB Created: 2021-06-25 22:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 1fc7e3b979cffb394d263b9d9f0e1c57 SHA-1: f5b12c85a47368629bec47b0b91392b13e256612 SHA-256: 4eccba44ef750454644d70c8df86c28a57f17cf99abb1bfd988d0a7117168af9
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links pointing to compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The heuristic 'SE_LOLBIN_RUN_COMMAND' indicates the presence of command-like sequences within the document text, further supporting malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00a3864ba---98231307439.pdf In PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/20370146045.pdfIn macro / runtime command snippet
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e0b51180e---kozadigazobufebulaxof.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebefd10c37---6358269174.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/tosifulixigupulad.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cf4ad9f42---limerawiguvitezoru.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ca5e2db63---pokopugaguvidinajutatoper.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c297c397afc---5665311384.pdfIn PDF document text
    • http://jaika.in/images/documents/files/titebinezojol.pdfIn PDF document text
    • https://irrisyst.eu/files/file/vawuvutukiwuzuzabi.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/70046230272.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0404261d28---vuvotogixafumilib.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/910e68d7c2f3a0c9b2cd368dabf25a04/bizezigizelu.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/u43tmn9b7r0cvoak0i7nctb7tq/20660717015.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/gixunukurameloluxuvaves.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/luteratej.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/00pu8d4frnm5o98vvk5kqtun94/49879346851.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/wuwijemipifoji.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/sazodupagobenox.pdfIn PDF document text
    • https://rachelrom.com/rescontent/file/80199596450.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/72666574695.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/pifupalomofala.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/19209313756.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c167ebc4fa5---viwukakogotupitikepima.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/lusinibekiwadotixujekulin.pdfIn PDF document text
    • http://islandpointfl.com/userimages/fesatot.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraftIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=mice+of+men+curlyPDF 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_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 16432 bytes
SHA-256: 96502050df65aecf0ee194f8a18d68ce4c9dccee4f4f14b401070663520bb86a
font_01_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13935 10276 bytes
SHA-256: 65c845480ded11c79ffd7b521f9424d4c87ef637965d473dc9468ce6e48d73de

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