Malicious PDF — malware analysis report

Static analysis result for SHA-256 93fa57a3fd3a3f4c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 06:00:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 700977dbe41868eabb109edd4f58ba75 SHA-1: 7867fa9cd18c66562de63208e878b4e46dbde382 SHA-256: 93fa57a3fd3a3f4c3f291e831a33bbc6f8d02f024ddf552359d6fe252f9685f1
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and multiple URLs, some of which point to compromised WordPress sites. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a shell, a common tactic for executing malicious commands. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://vamaconsulting.sk/userfiles/file/velavinudi.pdf In PDF document text
    • http://struttur-arch.it/userfiles/files/89338454985.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50448428630.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/94208664448.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/regifavewitivawusiwinef.pdfIn PDF document text
    • http://huucodatlanh.com/userfiles/file/99836234498.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/mamejanefomum.pdfIn PDF document text
    • http://neoneofitou.com/ckfinder/userfiles/files/rejelikivuju.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2d3d15db3---12979515566.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/h65csgs2n364s7npbnlh6lmfc5/vimomasafodow.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/0866125b1a24e889c7b048ca6eb35ad2/38094647947.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/genanegikokalimaxunane.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/tinijekiwomesofolo.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/wolulejuxupuf.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/xajavikoketaxixiwubur.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/51216992961.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/161428e922694f---51694019208.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/d02e85d1d6823dbc1a69aa7a5e20bd1b/pibekomimefov.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/a71b2ec0dde29743d9cec45d387aac09/89205993080.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/90834921548.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/31230080680.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/bowimifu.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/zanuroposev.pdfIn PDF document text
    • https://gibidesign.com/fckfiles/file/3919036670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=raspberry+pi+3+b%2B+android+tv+2020PDF 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_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 17688 bytes
SHA-256: 81fde90f6475b01e64382d8c6f1b62dac2ca2dcee2dec912aa568912cf5633f4
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2D 11116 bytes
SHA-256: 84e0b6dbdd2fcd7680c39d85845f0e201544d125115a1018219cd8c4fc914b9d

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