Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b558d084acb4e23…

MALICIOUS

PDF

72.5 KB Created: 2021-08-28 18:54:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 199262ab0f368ff39e07a51f968d7c93 SHA-1: 4008daec5f93978f00543a8d4864371ea6356d10 SHA-256: 4b558d084acb4e23c48cedd02b6086a6f8a1ba183e6eb0e9638427f9a758777c
236 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically using a password-protected archive pretext to conceal a malicious payload. The presence of numerous external URLs, many pointing to compromised CMS uploads or link farms, suggests an attempt to distribute malware or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the execution of a secondary stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 8

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://coretry.ru/uplcv?utm_term=water+horse+fish PDF link annotation
    • http://lagostena.it/userfiles/files/54609509404.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16091a54085666---jedex.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c691b0b5320d751ecf6851397a86b11d/79593639693.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8500a432fb---11084310275.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/sezuba.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/wevazigijosakawejeta.pdfIn PDF document text
    • http://imi.vc/upload/files/xonebadonefedid.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/jalubanosi.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/464b661f30d57f9f91d850775ddaca33/24586420784.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5dfb06c74540e665af863355a3636899/gijuroderivetutanebi.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/wujibisujaku.pdfIn PDF document text
    • http://cdmvt.cz/sites/default/files/99851189844.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/25160928884.pdfIn PDF document text
    • https://nepalimodelagency.com/userfiles/file/12205857057.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/368ead0cb6fe44e1d302eb67fd931f65/pupavugozoraripune.pdfIn PDF document text
    • http://qdcmd.com/data/files/gojof.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/buladikal.pdfIn PDF document text
    • http://sushibelovo.ru/files/nukirudokunesiwimoro.pdfIn macro / runtime command snippet
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b398d97e930---66762191563.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/31286380787.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/6q5appjfp014fuk1g3b73m7df7/gonapufibuvuvip.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/25153948751.pdfIn PDF document text
    • https://codecs.ro/images/file/jiwoxadelirixonazawowu.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2a827ebcd59db6d10610207af9f7c7d1/zidunegabekumulaz.pdfIn PDF document text
    • https://srmhospitalities.com/imIn 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_off0000be75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE75 14896 bytes
SHA-256: 30b044daa816c461cb3c9048a0fc578b23cc0992f69ae77c7215a56a60b72d2b
font_01_sfnt_off0000e34a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 10156 bytes
SHA-256: 815fcaf48b4031e7ae80cf0e4f418610dfcb00b325ec90ced9cdc2325c30ceb2

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