Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f75c13f0ed6ab12…

MALICIOUS

PDF

84.5 KB Created: 2021-09-23 08:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f636636a71b981bf2e1713045172a3c SHA-1: 17f0fce86960f3e7a4205716f8c51c1112620930 SHA-256: 6f75c13f0ed6ab127e4ee590e7b733becff0303c1be8f09ac3015f6c13ae9e7b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which appear to be part of a link farm. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to copy and paste content into a shell. This, combined with the ML classifier and ClamAV detection, strongly points to a phishing or malware delivery attempt. The numerous external URLs are likely part of the infrastructure to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=free+fortnite+codes+discord
    • http://massvt.sk/editor_uploads/system/files/fexosepo.pdf
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/69960872666.pdf
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/xidejabu.pdf
    • https://xn--z4qq44i.tw/upload/actfiles/78848564471.pdf
    • http://studiomarazzi.eu/userfiles/files/zutuxovopag.pdf
    • http://kleinschaden.expert/userfiles/file/60476661351.pdf
    • http://xn--2osv9pt2jfpt.com/uploadfiles/files/32713463817.pdf
    • http://oresteruggiero.com/userfiles/files/87982403303.pdf
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/4704264adc79dd7f9a6161d77c9f9a73/dofamuzeponaxe.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a9a0b22e2aaf8574fc05f0abf3fdf9ce/disosazowofidisexisav.pdf
    • http://laserinnsbruck.com/static/popajewadexesobo.pdf
    • https://friendsofmultisport.com/ckfinder/userfiles/files/zisaguminam.pdf
    • https://alwillislifecenter.org/ckfinder/userfiles/files/dalubasurusepomezom.pdf
    • https://kalimati.in/userfiles/file/26987461370.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/nadedivasalur.pdf
    • http://eggtesting.com/admin/uploads/file/wasesivobigun.pdf
    • https://www.sacict.or.th/ckfinder/userfiles/files/74873461458.pdf
    • http://yogo110.com/userfiles/file/48332578590.pdf
    • https://vozilasavozacem.rs/files/87005942664.pdf
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/tasegawilede.pdf
    • https://slide-bearing.com/d/files/64509135871.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132b64aa1179---15224603780.pdf
    • http://crabandclaw.com/uploads/files/koromitapapapomoro.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/85309956676.pdf
    • http://lamorenj.com/userfiles/files/10587064406.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e50c.bin
307801024de1cf5d36eba04a17a5b9131b5a4cd0bb827f2f559ce9366fea1b2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE50C 10236 bytes
font_01_sfnt_off0000fc21.bin
cfe54e6cc00f9a85ce3bb06fa9b0e9bcc3047e3a5ad5c5d5b79df6a4d2e0e5e8
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 18484 bytes
font_02_sfnt_off00012c4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C4E 16792 bytes