Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ee0be26939236b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 06:32:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d85205e57c58f3bddfc3707bf79a26ea SHA-1: c6f458e6550ba62341b79c34dc007cf7a333152d SHA-256: 82ee0be26939236bbc9e53cab7cd6d7bd323b81867d9674662347b2d39c22570
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting or potentially compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate a phishing or trojan payload.

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tano-cable.com/d/files/67869186973.pdf In PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7846874f35f22aff6e7215ba36e48d47/lefaworupotekowogu.pdfIn PDF document text
    • https://bloomeng.com/uploads/kuwige.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b75e7b9250b452ea99349c1456eef71a/vopubimorukesek.pdfIn PDF document text
    • https://ags-car.com/upload/files/51836980087.pdfIn PDF document text
    • http://mensagemcrista.com.br/ckfinder/userfiles/files/47358614235.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/gurog.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/ximuxikaxifonoge.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/58550170275.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/jorozexozononu.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/28250395876.pdfIn PDF document text
    • http://psycare-spb.com/userfiles/file/21363758861.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/94208589843.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/degoxudegeri.pdfIn PDF document text
    • https://pixel.bg/img/file/legiluvever.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/zojomojusesalugotudefage.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/18749583208.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411a293cdd3---lekexapojekefuvi.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/tabelowin.pdfIn PDF document text
    • http://yuli-china.ru/d/files/danilug.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/92314608856.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/pelaxajemizasasitotuke.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614118a306288---79985427746.pdfIn PDF document text
    • http://china-spec.ru/userfiles/file/zirumovefinas.pdfIn PDF document text
    • http://liderzy.natura2000.pl/imgturysta/files/sezugakedikukerape.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+convert+3d+movie+to+2d+in+androidPDF 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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF271 10752 bytes
SHA-256: b6b58429dc3149d19ee8781db7d5622159db002d99b0768702811fbdd082fd06
font_02_sfnt_off00010b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B42 18696 bytes
SHA-256: 139dc1420491a12603296d3ae41b5dcc5d61f8686c44e66ecf7a4eca6a78d02d

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