Malicious PDF — malware analysis report

Static analysis result for SHA-256 48debf36804c2d51…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 14:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a25e9006cd9c76d220d56c01d4024544 SHA-1: d3d3d46b1e4b66f79e7153560f7c752c26f782fc SHA-256: 48debf36804c2d51d58ba0881b67a5ea4ba876f2c67e3146534eb0eefa0e095e
196 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to malicious content, with one URL pointing to a compromised WordPress site. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs the user to copy and paste content into a shell, a common tactic for executing downloaded payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://laborke.ru/uplcv?utm_term=windows+7+500mb+iso PDF link annotation
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/tasifanoxut.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/karexuxekodojo.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/86881769701.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163084023528754285851.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/63716738996.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de23fd1c6d---12010753662.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/950001ol3rbq7o9ers72b8p993/besidetosin.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/19204487905.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/84520273546.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/83261460148.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbfd3b99a5---17867075674.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/68956268691.pdfIn PDF document text
    • https://aljuboori.com/userfiles/files/lixisewisakaz.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/pamojemizakabotilelepumet.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/15007850042.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/25527083971.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lugufanufekorezipased.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/gutegowuwuranef.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/28128346842.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/zowufetojagumiwibudami.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-11/20210911104720858475.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/rozavepejujizusuronifa.pdfIn PDF document text
    • https://b2cdemo.tickets.com/content/files/67506410343.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 17560 bytes
SHA-256: 48390e402b05c9c169c44d9b0a5929d83cfc1d75a7a5daa6bfa5dc484d08efea
font_01_sfnt_off000102b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B6 10396 bytes
SHA-256: 340ca488005d742f0c1fef52cab669f4dd17d07ba1027634b248e519def244c6
font_02_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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