Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2331e641ed5847a…

MALICIOUS

PDF

68.3 KB Created: 2021-09-18 07:47:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb9fd56148b2fa387fec7c4a8053e4f8 SHA-1: 9969f8edca553d452c5e4b2cff7c0e6742050256 SHA-256: f2331e641ed5847a83d3cad5b68a3827e68658c3f6dc3d17c54e6e06f6f6175f
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a phishing lure. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent to trick users into divulging sensitive recovery secrets or private keys. While no scripts were directly extracted, the presence of numerous external URLs, some pointing to compromised CMS uploads, suggests a mechanism for delivering further malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • 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://smart-ventures.ch/upload/Editor_Images/files/14726305315.pdf In PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/wosixawogatexalex.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/1824415485.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/kujunaroj.pdfIn PDF document text
    • http://kukdae.com/files/fckeditor/file/6156679980.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/22866096819.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/kuvidun.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/dimafonetusal.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/sewujitovug.pdfIn PDF document text
    • https://www.kuwaitpolyurethane.com/ckfinder/userfiles/files/jonawofijoxixi.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/8354431302.pdfIn PDF document text
    • http://air-separation-supplier.com/d/files/zojuwevujagagekud.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161451debf1f7c---kuzofefose.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/o21uvenbmf0hnhutss953tvs5o/41205340438.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/75685201054.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/bulidafaziwavuralige.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/10389148634.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/wolopudulavopinosi.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16132563618fbe---rakijevepu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142419cc5532---kapaxowasi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+sha1+key+in+android+studioPDF 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_off0000ad14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC526 14864 bytes
SHA-256: f57ea55b3c5e2708469008eb1f5b89c2a75082d6c37db719a00cac8b6b938e0b
font_02_sfnt_off0000ea93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA93 10916 bytes
SHA-256: 75ca5465e3a277184b4a46b2f580e38d4597b5e60ee156894755887dc49928e3

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