Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b8abda72916c51…

MALICIOUS

PDF

87.2 KB Created: 2021-06-27 22:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 22487c986339260d2f6f3f955ff97e9f SHA-1: 6d32daf913da40534be587b8782879fd58c8bad1 SHA-256: 85b8abda72916c513ba639da745cff092c9a934153d2ea560fe61610fab51bf8
236 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text fragments suggesting a lure to install a browser extension or update, a common social-engineering tactic. Numerous embedded URLs point to various domains, many of which appear to be compromised WordPress sites, likely serving as part of a link farm or hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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.
  • 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 https://smidgel.ru/uplcv?utm_term=how+to+save+an+edited+pdf+on+chrome PDF link annotation
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f3fb8d58fb55bfc2b3d11177ce2edc0c/44027926367.pdfIn PDF document text
    • http://nessium.net/userfiles/file/galulawapeminavuf.pdfIn PDF document text
    • https://lesfeesdelhetre.fr/upload/files/1324684942.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/a701ea5dba38da308b5d267d3bddfe06/773702842.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608357f830d43---40307556484.pdfIn PDF document text
    • https://jodhpurtravels.com/nbloom/fckuploads/file/53198342197.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/42797e0074da99ef2c850d1573957606/4054876496.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/b9c07c38d3bef11477ff8cc24e9bc196/24973303644.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071c2c475f36---75911421029.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/nubasetejagatag.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1609ce2e2551f3---bajej.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160874b9f8da49---pofikekowujogoluxoradoli.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/poviguzofipiputuba.pdfIn PDF document text
    • http://klhl.com/userfiles/file/37273168797.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0602f1e67e---13689640373.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be7d6fc736c---61356968756.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/24cc38f07dd4cfc88ba9ba3d468dcef4/92837755500.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/26287131524.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/24121918931.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f66ae876f---lunuxo.pdfIn PDF document text
    • http://macautemple.com/userfiles/file/womunajexig.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8E 17488 bytes
SHA-256: 0ff8496a70f69a04aa82d8c757223ab6534d783ccd5113b84ccd72fd3fa5cd55
font_01_sfnt_off00010866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10866 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12077 16084 bytes
SHA-256: dae5038d748b2b7d89173d83a61ff0ceefc2856cc76f3bb6f5837745f88f8889
font_03_sfnt_off000135a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135A7 10980 bytes
SHA-256: a2222d72511ad40fad322ddae42736571ed17c0f1266dda22f840446be54956f

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