Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cbded2ba5bbcafe…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 14:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9b29bb678e90dfc1332d64b586193d4 SHA-1: dae7e4be272445e9546ad8bc090f9c5b4a255e4a SHA-256: 4cbded2ba5bbcafed9ab8ce77af170acfc87327d562790a05967768a0657fee9
196 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_CLIPBOARD_COMMAND_LURE' heuristic. The document's content, though obfuscated, likely instructs the user to copy and paste data into a command-line interface, a common tactic for executing malicious scripts or payloads. The presence of numerous URLs pointing to compromised WordPress sites and other domains suggests an attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d33186a9b---84980211840.pdf In PDF document text
    • https://llsindia.in/FCKeditor/file/31661103361.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5cd5b0234---buxinifaro.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0a4b1f21c---78869075962.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1610a11dbb0e37---jaxup.pdfIn PDF document text
    • http://rcot.by/pics/files/84998039550.pdfIn PDF document text
    • https://spheresignal.com/app/webroot/userfiles/files/5864243504.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/pipekajilamel.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee661a63a---58903171637.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/tupevusireteb.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/11274622.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ed9820b3b---64657521611.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/zadafugupu.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf8437899dc---libeginoz.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5341e7ae8ba1f351981cd2cdfed1e146/81072598779.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/4f26e8501e9d267197f4e61e94df3716/dovigagosuzewutak.pdfIn PDF document text
    • http://familiehollander.nl/images/uploadedimages/file/40720707214.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/parogakepipezulitugoso.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/kotumivoxowusewafoxetu.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f9c401e3c---wenoruzu.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/20963592047.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/907955be9f24011770584252503343c7/79915032636.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/depiruvojuwefana.pdfIn PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kojolibiwel.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/5365f414eca82b367667fd2d49686425/53059221844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+reinstall+keyboard+driver+windows+7PDF 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_off0000eb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 16652 bytes
SHA-256: f652aa38e7e41bc18b8183369f23ad3728302be7475bba30499aeac9aa88cac9
font_02_sfnt_off00012e94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E94 10780 bytes
SHA-256: d074b36c5232ab252b6b899df44ae126ebf6fe3561d46ffebb08f529b1137238

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