Malicious PDF — malware analysis report

Static analysis result for SHA-256 92794ed864075bf2…

MALICIOUS

PDF

79.2 KB Created: 2021-09-24 06:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 963a2e559ed3526a2d3a63395478245e SHA-1: 09df3f7a37956e828724870b07aaf36eeb662ff7 SHA-256: 92794ed864075bf2e6327f6ef64fb35de19f02b203ecee57e5fb50f8cb64bc58
196 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and potentially a phishing lure. Crucially, it includes a 'Clipboard command execution lure' heuristic, instructing the user to copy and paste content into a shell, which is a common technique for executing malicious commands. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the combination of these factors suggests the document's primary purpose is to facilitate the execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://centronegozi.com/public/vizelobefapufisav.pdf In PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090522285670693.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613313eaa8f82---kexivomitisawapeseki.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/winukewunixud.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/24879604818.pdfIn PDF document text
    • http://iscyber.com/userfiles/files/lixafujuputikexovenoguwub.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/08abe12f6c2b1cc282a33bd375ff5dab/mexape.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161420bc29daad---22019719397.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/komufolelifavadebafi.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/miwalize.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/095000adad717be3b4704e90506aaa66/buwetopa.pdfIn PDF document text
    • https://dolphinsolutions.net/ckfinder/userfiles/files/8530697724.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/50836640333.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3bae2aabce49c1db4452bab326a6c4c5/roperarotonilejexubewemub.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/4678381746.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/473923021.pdfIn PDF document text
    • http://alltechsro.cz/files/gelajof.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/90512266878.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/64937514038.pdfIn PDF document text
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/zakatexakesotomafadu.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/vizagafepurajojariz.pdfIn PDF document text
    • http://aicpwdosaeast.com/ckfinder/userfiles/files/24421488301.pdfIn PDF document text
    • https://jf-orvalho.pt/userfiles/file/54891814180.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/werufejuduvuniwolibujeki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+get+paid+apps+for+free+with+cydia+ios+12PDF 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_off0000cf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 17472 bytes
SHA-256: 3cffa4172a837e47934b5712e215fe2f95dd6d19adaf53d1e3fd38856aecb27a
font_01_sfnt_off0000fce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE7 11112 bytes
SHA-256: 238f1cbf81d0e54522d5ac8ffacfe2a5dfc3ca095df22aadf8db2ac327052f2b
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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