Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e5cfcba7894b33…

MALICIOUS

PDF

200.7 KB Created: 2021-09-01 05:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f4e240ce9f3e304e9819e84e5d7dfe5 SHA-1: d3c7216460d75de2fd46c33d5f22cb55a69def0c SHA-256: 51e5cfcba7894b33fcf252777171b579c996d1dc1ea36ed25dfe454d00e03c23
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's primary goal is to trick users into divulging recovery secrets or private keys. While no scripts were directly extracted, the presence of numerous links to compromised WordPress upload directories suggests a potential for second-stage payload delivery, likely initiated through a user interaction prompted by the document's deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9743

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
  • 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.
  • 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://chemonova.com/FCKeditor/file/52486132600.pdf In PDF document text
    • https://termofriz.rs//files/20326286850.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6d2268a78675a4fc54ae0f5f9469eca1/65305378986.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/tuverora.pdfIn PDF document text
    • https://ecoverservice.be/gallery/file/54692310414.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4503e024dfdb8ede6f3b540fc7542472/17481094207.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/jj56go4lvlcmlrmgk6h32g4id5/zefapex.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160770233c6f6f---vofujolamagisu.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/192259088.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/23911893905.pdfIn PDF document text
    • http://ominocoibaffi.it/userfiles/files/9640654969.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f94c8ddb---fojipimerididevin.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/73830e2c9c0fc33004e9614dd23d83bd/36731686429.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0a6eb32ef---19934108914.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/puripunovatufufulegij.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b46377cba4b---lipeni.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/183349dbe150ccaed7fb630514e1e6de/72858433815.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ac0a003b4303af198c40f7f3cb3cf052/15635905345.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/jelogurepejemavipi.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad2b66cf7a5---paxolalolitaxabavogos.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b8ea4b9a4c9---wezerotukum.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/medezupefitisukezerajufo.pdfIn PDF document text
    • http://fobosgrunt.ru/files/ckfinder/files/tafamanad.pdfIn PDF document text
    • http://huntland.hu/upload/file/23711968451.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/lozajufuzesulore.pdfIn PDF document text
    • http://etnorom.hu/pictures/68757397361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=picture+and+fax+viewerPDF 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_off0002b050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B050 19772 bytes
SHA-256: 35a0092cada9a91cd116324b0e204a707a6a312a96d29b3217eb36eadbe78a74
font_01_sfnt_off0002e447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E447 10492 bytes
SHA-256: 1cf552df003fd3fb9f70e265ff61fd1a71beeb8b076b993d446b8ad46aa5ff2f
font_02_sfnt_off0002fc52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FC52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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