Malicious PDF — malware analysis report

Static analysis result for SHA-256 424b2be6a423883c…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 12:21:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9b2029c8a1b3566dfa835d57ff4f5e6 SHA-1: 0ce5c1a6ec83e962f8267df7bfca887df3e150ee SHA-256: 424b2be6a423883ca3a08419ee9d4b84a60d336082c913089db7f5bd06c07dfc
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The ML classifier and ClamAV detection strongly indicate maliciousness. The heuristic 'SE_SECRET_RECOVERY_LURE' suggests the document's purpose is to trick users into revealing recovery secrets or private keys. Numerous URLs point to potentially compromised or disposable hosting, likely serving as lures or hosting further stages of the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://webelievedin1984.com/clients/6/67/676624d6593aa512bfa6e10e765af00e/File/sigubagizexel.pdf In PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/begekufebibudi.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/kagekin.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/82932281609388ff1493c5b2b995a248/41587070505.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/23934681505.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/jepedudaxikufozabi.pdfIn PDF document text
    • http://beadsandsupplies.com/images/file/xidez.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/tvj867em5img6q1ju1n3e5deg5/84511876516.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/bf5fdf9c4fef51870a39537c2516a007/5352122421.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/98182743364.pdfIn PDF document text
    • http://reginahajo.hu/_user/file/tisabamonuxe.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/r3j501ufqcs9r3g50dms5uo1e5/gutidalukafatevegokune.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/pugixasibu.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bafcdbdaf64---sejejivukogisajesak.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d7c53bf3---31746654506.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/kurexorexepelamor.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/mekude.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/kopekelinaxopovixafiseruw.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/jurajuvejagepafe.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/pigolekuwosenegewoluxaza.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/gabaniban.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/bawufipazidapaluxenor.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/gepukemotalofajududonor.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/jadifijux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=secure+socket+layer+pdfPDF 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_off0000db18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB18 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32F 10796 bytes
SHA-256: 888d301ef2aa9acaf5e0f6f4a7f03f3d29aaaab6f65ce041eabc7dc91dc56958
font_02_sfnt_off00010c47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 17316 bytes
SHA-256: 83ff59fb19ebf75e5e6be43996f64d10bf79539629b6b74bb0bf676640b07811