Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f306e52c43fcbb8…

MALICIOUS

PDF

74.9 KB Created: 2021-09-03 17:34:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 745ca727619e3fb660965ecbf0469f91 SHA-1: 18c5556399f0393b50ea01e4135b1ba0b7d3d1b5 SHA-256: 6f306e52c43fcbb895a8645cea49eb9f365bedff61214d2398bd8c5e713c8f82
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. These sites likely serve as landing pages for phishing attacks or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://noihoithanhtuan.com/media/ftp/file/wenuzatujenexufalineluxu.pdf In PDF document text
    • http://springgalleryng.com/Images_upload/files/pidesim.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/65137522659.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16108c7c5d25fb---36470722669.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/lexebesozagukataka.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/26347518921.pdfIn PDF document text
    • http://xycrusher.com/d/files/lobimefatewojibavagafag.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/7585460400.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/arluac2c5n87iia2fe3v4l97ih/94352222090.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/95681704967.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/11392643764.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/68616469027.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/1d53749256481afca152ceef53403cee/gosuxefogamelikogavune.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/52261357338.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/4id5drlosvg9ddfh34d3p1ge7d/25685284751.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/bososugutivekagev.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/xeraruloropami.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/84ae93d0398d175d7b66e11620a6d2c2/36911764418.pdfIn PDF document text
    • https://rjpexport.com/files/wuluselid.pdfIn PDF document text
    • https://diphong.com/uploads/jinotunamovax.pdfIn PDF document text
    • http://sns.hu/_user/file/rawukigaliperi.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/banopidifuxu.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b3152e196e3---zokogola.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/54125117697.pdfIn PDF document text
    • http://canadanur.com/resimler/files/5324635363.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/h9q454juec0jj672n7vdbg5dqk/71347924011.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wuvezivog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fdot+stormwater+drainage+manualPDF 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_off0000c303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC303 10752 bytes
SHA-256: 8b82a4100d7b61181fee4e4fa5dc1dcc6beb04b9e776a5b59cb2152cab1e7e7a
font_01_sfnt_off0000db8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A0 16560 bytes
SHA-256: 6d18e8aca26e7b1212f4d76d58b3c6dbefbcbcd696b100db04710e2afa8c5af4

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