Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c22921a5dfb89f8…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 05:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b06a05c9f82a371b3a324cfc5e324e8e SHA-1: eaa75f67d47b133689e04e0e0c13a51605635fe6 SHA-256: 1c22921a5dfb89f841690a12a29463e462b349b67cd3fd75742eefd91c83f797
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier and exhibits characteristics of a phishing or social engineering attack. The heuristics indicate it contains a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content. Crucially, it employs a 'secret recovery lure' and a 'clipboard command lure', instructing the user to copy and paste sensitive information or commands into a shell, likely to steal credentials or private keys. The presence of these lures strongly suggests a targeted attack aimed at extracting valuable user data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://eprobatdz.com/ckfinder/userfiles/files/sugage.pdf In PDF document text
    • http://4reality.cz/userfiles/files/gemutikimivirav.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/mivakazovawozusujobad.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/buraxoziruna.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/felizu.pdfIn PDF document text
    • https://onwater.my/uploads/file/xolodoperubaban.pdfIn PDF document text
    • https://xetnghiemadndanang.com/upload/userfiles/files/karizorafeparapafabi.pdfIn PDF document text
    • http://stnicholasway.com/userfiles/file/84628943102.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/jadevakibapox.pdfIn PDF document text
    • https://eko-briketes.lv/userfiles/files/zusuzitekit.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/zatorotaviwubixinigizibik.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/55560055739.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16136f53466ad1---gezatixezobexima.pdfIn PDF document text
    • http://kccmaul.com/files/files/81365103672.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/edbc88c4752aa1d00a2ad818880d5109/83365109460.pdfIn PDF document text
    • https://groupekineconcept.com/userfiles/file/82103643882.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/53648554950.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/18947658391.pdfIn PDF document text
    • https://geloracinta.com/contents/files/wosuxawujed.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f14c4ae7---xigudufedoz.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380c488d309---kiwakofanoku.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/74848308972.pdfIn PDF document text
    • https://www.tcf.gov.tr/ckfinder/userfiles/files/fedeluributesel.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/xoxep.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/45555146412.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=download+new+movies+torrent+magnetPDF 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_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 18036 bytes
SHA-256: d941a8d24b3bb3871e1762e10ee13aa04a680d7ae53105bd229a43d95bf5460d
font_02_sfnt_off000120ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120ED 10744 bytes
SHA-256: 316503a2452961920c64e21cddb4ac6b93427e98389b6eca242194227ee5d3a9

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