Malicious PDF — malware analysis report

Static analysis result for SHA-256 4594b3b5da483e0a…

MALICIOUS

PDF

95.6 KB Created: 2021-08-01 07:12:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: d5ca65867a8e09123c6163b1f8aa553b SHA-1: e42adf86106fee3d4526eef063c960c185fce839 SHA-256: 4594b3b5da483e0a86bf3e8341498f8b3da05b672fa610c5b6e550af875243f2
156 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 a machine learning classifier. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised WordPress sites. The primary purpose seems to be SEO manipulation or directing users to potentially malicious content, as indicated by the 'utm_term' parameter in one of the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://archism.ru/uplcv?utm_term=naruto+ultimate+ninja+storm+4+ppsspp+free+download+file+android PDF link annotation
    • http://dchs1961.com/clients/871949/File/mamalu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/2b698d18d8a75d695607d9a137d16778/patubetowemefifije.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/d0g68gro6ol9oj1e8et685ahl0/84619975824.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/9919082724.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/gozanadexewagegududa.pdfIn PDF document text
    • http://apsons.eu/files/file/jevofaxorif.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/tujeraribomob.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160985c58889d4---gitonozotefasetew.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/e94695996b1aa1f1f8a3adcba5f713e0/wufonen.pdfIn PDF document text
    • https://vyrukrc.lt/userfiles/file/napiviz.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/60598420507.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/55953745834.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da100389f5---65798008834.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839d4865aa2---mezad.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afa2f3d62c5---xisokisuta.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/j7m0c746rejgvlglbcdhgm15qp/72113311479.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6d80c1d3e8---37999325414.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-5/file/75346084725.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/is91aburaok3ju9a2gp51jnjn5/pufade.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/45501361767.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/17305065299.pdfIn PDF document text
    • http://2016.letnifestiwal.pl/ckfinder/userfiles/files/18371088650.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zasutelib.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1620343810.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/7eaf8273d44e5f2b04127d4bc28dc3f6/58327594130.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 16168 bytes
SHA-256: 2f088311e3cc47affea05821c2def65328b1f74a195200b1b3e81469be6e99d2
font_01_sfnt_off00010ea8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA8 17368 bytes
SHA-256: e5c269addfa3e2dffd946984f6298007d8ee322dd851ba9962a04f3e7ccc00a0
font_02_sfnt_off00013c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C60 11032 bytes
SHA-256: 9cec2b455fdf9dfc7c0ea9e653dfa172aba2072874eb91686260fe7d75b4e1f9
font_03_sfnt_off00015610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15610 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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