Malicious PDF — malware analysis report

Static analysis result for SHA-256 eedd5fbbc51409fa…

MALICIOUS

PDF

93.7 KB Created: 2021-09-06 12:28:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 063c0e665e1b886882337e69e0dfcf63 SHA-1: fb23a49eb8b873e130b6942ed75c2a6b158c0e43 SHA-256: eedd5fbbc51409fad1ae68bc8da232cbc06f36031337711b92917689ecd8f858
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=free+printable+math+worksheets+fractions+decimals+percents PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607154da3eb69---69855768039.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/sujagorobozaboguwalesajor.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/nsfalt9uk3jelgb7pkun0ttvs6/5870103710.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c87f307090f---59763637129.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/23711993897.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607858ce5d213---wakoxu.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/29260992887535b3eff1f075839066cb/xalotamesusukojezufor.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991d3220a9c---52418481167.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609460f2c684e---53872127867.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16078c3d7c5413---90260054933.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/jinufuguwi.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/vinajofezafavagej.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/kuroxubesevuxovilolupe.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/39650554053.pdfIn PDF document text
    • http://randalljroutson.com/clients/44711/File/78072451642.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ff75ba8adcccae9db8f7eeacceb02044/92665878857.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/jesepozovelizanuxokedib.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160c5aa61930ea---37994247841.pdfIn PDF document text
    • https://discovercefalu.it/_data/images/file/nawukuti.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/nifalunimarijorar.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/betuzedagujijikimanu.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/38492491025.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/30206535110.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/xemerarutitafe.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/c1036d7e9ac86d962c47a0c94576ac1b/69684746884.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_off0001043b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C52 11180 bytes
SHA-256: 6a4c69d7f395d651503a8e026502825e4966f7cf8441765cdb0c934d2a0f8a0f
font_02_sfnt_off0001360f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360F 20084 bytes
SHA-256: 58b5ed5d39a9a97d4daa1d482bcd17c5d2066debdfd6074cc8314b5d88c83a21

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