Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f10f39d35aa7cc1…

MALICIOUS

PDF

83.4 KB Created: 2021-08-17 13:58:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 946cf2d4a6bd8ad289cdc654cbba64cf SHA-1: f57bcb9e9cf91c101341a0f933a5016a81acda7f SHA-256: 6f10f39d35aa7cc13e2f5d78f02069724313e10c79e15e71f2bf8402de541c30
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites, suggesting it is used for phishing or to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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 https://nomylo.ru/uplcv?utm_term=ejercicios+lengua+4+primaria+diptongos+e+hiatos PDF link annotation
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16086716340b52---84516622865.pdfIn PDF document text
    • https://inifd.london/uploads/file/zudidivimupefewolaw.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b2da1b962---kafudeze.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/41770458365.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/q97o02026atiqrdhnh0n71veoh/8134925540.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/zigevem.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/zoguzadiferabapizoxab.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d3ae21448ac---lalodojofeponetasobovewu.pdfIn PDF document text
    • http://donghocitizenchinhhang.com/uploads/userfiles/file/24454792900.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608256020b136---tawimovulatukogefafitex.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/15194021699.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/tajuner.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4f370020dd2b65c449eea00cd5649597/24033413166.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/557a78c335b604bd8be9fcd8a2bd09e6/35698309924.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/luwojilajexevefikugo.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc8ff3c174---54798538359.pdfIn PDF document text
    • http://businessplan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/82555037992.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/51344364357.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/seliwolodefezakutez.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/xipovirelirafalufawemoloz.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/58903353720.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/rm2lp3vv17p8m103c3n9n0tbc7/54716404386.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/40292170724.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202107181258258739.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/mawelojagosepabezaf.pdfIn PDF document text
    • 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_off0000e04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04F 11252 bytes
SHA-256: 20154bf5da44c92c42b2c9cdab81fbeea68a4cc72a50b4473cbc2498644615cd
font_01_sfnt_off0000fa43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA43 17200 bytes
SHA-256: dbf21bca767dae88fc77d11dcba0f6f6d4c6dd67d3b00e6140805bb1bd74230e
font_02_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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