Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ab38fecc9382d7…

MALICIOUS

PDF

76.9 KB Created: 2021-09-02 15:16:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 138cef27df2160adaac273f124483bf6 SHA-1: 6258e30e45d1b1241de66eb5caedae512fe29480 SHA-256: 21ab38fecc9382d7c7e17040fce8280a0d5921e2b10b6e7ee7eb1c28ccae0796
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. The presence of external URI heuristics and link farm indicators points towards a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://www.natursany.com/ckfinder/userfiles/files/9935073053.pdf In PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/347164235.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/duwofejijujikiwobifolaxu.pdfIn PDF document text
    • http://93564497.com/userfiles/lusogukokamoguvome.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9386153d4---47771632706.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/lirogotike.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/74349162737.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e0d64ad0805c36d19c5208c8e2e819b6/53597164905.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/o3ob7fnneqtcu1fgnlai0nrq5u/97504068213.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/xewupufodiwomimelekumeb.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/lutifogojig.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/16092e7eb7f81e---65873791257.pdfIn PDF document text
    • https://mytekas.com/UserFiles/file/bumokuvokojogeforip.pdfIn PDF document text
    • https://www.ideaklinikankara.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fefb3baa01---66219475527.pdfIn PDF document text
    • http://childhood-matters.com/clients/49507/File/85534793189.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/wemek.pdfIn PDF document text
    • http://artospace.com/pics/file/63300665223.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/22504995603.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/b2014178f0af622ee3dd2eade746e66d/bikexexazeriwe.pdfIn PDF document text
    • https://cupanghitam.com/contents//files/46249617627.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/xikobudimifikugefefodape.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/sivedisiri.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/rq75sipvajt50crso45tkpaepk/ruwivusonelawasekazile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=real-life+discipleship+training+manual+pdfPDF link annotation
    • 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_off0000c70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1E 17512 bytes
SHA-256: b0ad0ab2484861b201bd1cb1ae53c6695f694759849ec2c1297a36d7403ece4c
font_02_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 11128 bytes
SHA-256: f87c8001e8341ef2f6ff747f96cf0f633175665d4475fc54e64d4fe73574799b

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