Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36044859a80e829…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 07:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8d5a09c19091e943bba89ff246ae7c68 SHA-1: 8494c600929b1af4f067d11d6c46972fa0bd2c1c SHA-256: d36044859a80e829ca64beea072511e5b14a47adedd7ae8c6d5bca6d6bddac5e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript and numerous URLs pointing to compromised WordPress sites, indicating it's designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The embedded JavaScript is likely responsible for executing the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=multicellular+organisms+worksheet PDF link annotation
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16084e18904ba2---sutiletomoxewapizuxizujo.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/kugojonidawiretudiserare.pdfIn PDF document text
    • https://norservis.info/files/files/xarugip.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/826d9pjoftrcd6omo3ep17oi9c/60357692307.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/gowamaxawakutirero.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/futirazewap.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/9f94ddbc1dcf06e74abd55c9f90ad048/biwumozuzesosen.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/advnsj9v3utqmcb9njvk6iilti/dovek.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210904121743_md4gx7.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/67585249788.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/50136587608.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160b0578c998c0---76343743987.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/tumukituzetekaselaka.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/423333572.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/95694770321.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/37117466413.pdfIn PDF document text
    • https://taksis.lv/taksis/userfiles/file/45619198012.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/04aff264d813e0af0541b586de63e3f2/toxavefizunotolevalolafo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbcb6d7e74---tokufutotoduvaza.pdfIn PDF document text
    • http://yuli-china.ru/d/files/86447963189.pdfIn PDF document text
    • http://jarosi.hu/files/file/9615535902.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nits21sd9tioskv0qpr86j0tf4/fejovotuzenuze.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/gimosipe.pdfIn PDF document text
    • http://boisehighclassof1965.com/clients/879780/File/kesituxexafe.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_off0000be82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE82 15492 bytes
SHA-256: 651338dc2cf9e607d6988cc80fbf1c1dacd3b12156147d4edc88852ce1a866dc
font_01_sfnt_off0000e63a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63A 10948 bytes
SHA-256: e2acaf3ac5e65109dbf505900e450dd0517c4bca6cf655c616deb123a5457572
font_02_sfnt_off0000ff82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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