Malicious PDF — malware analysis report

Static analysis result for SHA-256 16f808b37a29b62a…

MALICIOUS

PDF

83.4 KB Created: 2021-08-22 23:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d2bf3498e9b5c255db9e0138d1f2644c SHA-1: dfe3c23379342f770f3c9de9b0b4201de649d16b SHA-256: 16f808b37a29b62a6dbc3346ac1d689cc64b9fb724f68823f3cee9f8727683c3
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 an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/47225e60c4d86e2f2623b09e7783f5b7/vedas.pdf In PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/karoxujefata.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/susixapukopagatesako.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/7915921998.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/52559841447.pdfIn PDF document text
    • https://olterus.org/contents//files/4889047863.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/6uchrf67psu6vlbugrv7tjoquh/11377272248.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b6a6cd9561e33274d80e7968b2b3c38c/97302535054.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/47743901825.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/kelivuzebamunumunazug.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0b6a67c67---50582773991.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xalaweropimapirogebifej.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/52892174383.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/86392130691.pdfIn PDF document text
    • http://klimagra.pl/images/wysiwyg_img/file/59931007513.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/52795143691.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2223ac303---rezotogap.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/dugasuvomutogozuf.pdfIn PDF document text
    • http://julianina.dk/upload/file/viwulisofonenit.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/givijajalimo.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739497a2a71---79699154172.pdfIn PDF document text
    • https://www.carrentchiengmai.com/files/27583176486.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/ritotuje.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/xisisifilik.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/buboloxizofovupisazu.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b727070d4b0---92950908642.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=sivi+%C3%A7%C3%B6zeltiler+ve+%C3%A7%C3%B6z%C3%BCn%C3%BCrl%C3%BCk+%C3%A7%C4%B1km%C4%B1%C5%9F+sorular+tytePDF 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_off0000df5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5F 11668 bytes
SHA-256: 7738f7fbb946ec0960305f9d0cbf946e41dbe68c1dbbba244dee3dd384b38366
font_01_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 17316 bytes
SHA-256: 95afec1f7b05eb643102b9a974e2d25e6e5d74f3ad4f22e73a1a6e39a2bc4280
font_02_sfnt_off00012484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12484 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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