Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb3bee79adc23f4f…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 04:23:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e033c78dc77aec75efa3606fece6843 SHA-1: f609c0c891bd011a8fa28db2eea69ab84ac08722 SHA-256: eb3bee79adc23f4f8ec414a337f8850b03c6071443759439a753a4f426d76b25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm designed to leverage search engine optimization for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://smidgel.ru/uplcv?utm_term=three+mistakes+of+my+life+filetype+pdf PDF link annotation
    • http://www.ondebiz.com/userfiles/file/67746981018.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de0a913390---40033672648.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/56339769961.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/126467619331628444079.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/wujupopidavalisiwor.pdfIn PDF document text
    • http://xtra360.net/campannas/file/pupubu.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/dapavijitugavixal.pdfIn PDF document text
    • http://fine-trading-knotwork.de/uploads/media/13846950852.pdfIn PDF document text
    • https://073741256.com/uploads/files/202108262103034935.pdfIn PDF document text
    • http://redsky.tv/userfiles/files/keselatot.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160864a291e10a---36423773512.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/24030449648.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/tjq4ogk69sa2t8sbsfskrdsn08/nodosewevenuxusam.pdfIn PDF document text
    • https://pasarangroup2.com/contents//files/belegetepodasujoziz.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/fogufokupizaxikamugu.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/e775d2a90373c153a85d0fb116ed8e84/kalazeketodoxew.pdfIn PDF document text
    • http://schokobrunnen.com/idata/16233158374.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/6269c93f50e4b9392e9a55e1a52acedc/37127058958.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/dexiwu.pdfIn PDF document text
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/fb1941830ec4660351321bf79093891b/nufatuwajoxuk.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/gipobatawuvezopololi.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16076c4c47fa00---10515151619.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_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 10828 bytes
SHA-256: 11277758da7eeb9a6045053f6ce5e6ecb31adcb98b3e506d6cb6b20dd588b3b0
font_01_sfnt_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 17708 bytes
SHA-256: fbca869d6bfcda619b3c6f49493a61fce904329681c01148313ef0b9dc6ef9d8
font_02_sfnt_off0001126e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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