Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a35ea076d608956…

MALICIOUS

PDF

83.8 KB Created: 2021-09-18 05:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 33a7e7b2de07f9ee8efe80e09f10eb7e SHA-1: 12fcc971021c54fe61cd8f001cefe207d3cdb309 SHA-256: 6a35ea076d608956741e6cff5d271c0674680ce09a475f6a87e3a321f4d863c9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV. A critical heuristic indicates a 'Clipboard command execution lure,' suggesting the document instructs users to paste content into a command-line interface. This, combined with numerous embedded URLs pointing to potentially compromised sites, indicates an attempt to trick the user into executing malicious commands, likely for downloading further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://alrukn.co/userfiles/files/50984553956.pdf In PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/rumazotoxozikosiki.pdfIn PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/96776767495.pdfIn PDF document text
    • http://www.bash.cl/media/file/9067769491.pdfIn PDF document text
    • http://studiorestagno.eu/userfiles/files/14744289114.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/67333471429.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/50330751507.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/jikitovukutivutifasufi.pdfIn PDF document text
    • http://poliinc.com/upload/files/ganowuwikelexezu.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/91858001058.pdfIn PDF document text
    • https://defi128.com/userfiles/files/gotixokipiv.pdfIn PDF document text
    • http://robertwestlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tagitipoje.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f45e3bc47a---jurugijupopikiko.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab34ce5a0---rubegimagojefubimofowo.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/35316469838.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/37022717385.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/47874848981.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/a83b58482283d02e2acb877b63806fc6/52780036042.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/31222779063.pdfIn PDF document text
    • http://parilka.by/var/upload/file/8124043437.pdfIn PDF document text
    • http://fgosvo.ru/files/files/lirelezibobixotofomuvum.pdfIn PDF document text
    • https://sadex.pl/fck/file/zaliwexuvojowe.pdfIn PDF document text
    • http://budka39.ru/files/11831087509.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/woruteve.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=fastboot+hard+resetPDF 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_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 10220 bytes
SHA-256: a586316d76f68f1272060d9333918f801b60e7c2b083cf7ac5ee50df82b54677
font_02_sfnt_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 18012 bytes
SHA-256: ccd510be2fe6a9c948985065764bbce96dd24d1175dbf9d766c9fdc7d656417b

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