Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae4476e98dd20a13…

MALICIOUS

PDF

99.0 KB Created: 2021-08-11 21:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 142ff240546c98086607726e4ee29cec SHA-1: 3f78b076096292069dfd013a8d9845b33c417a84 SHA-256: ae4476e98dd20a1371290f71580f15894e6e7d93ff5a223e5a23b38db27e46fc
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/ca6ebce0e9f3a69f012bd318a9846232/keturafixadixemeperowo.pdf In PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef5e995c5---13367374352.pdfIn PDF document text
    • http://birkhoffhi.com/userfiles/files/3962941028.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/40110757953.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/b90ab516fc4e83ef5324f409d030f0da/sisagikenamu.pdfIn PDF document text
    • http://cameragiaminh.com/upload/files/36739149076.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/rotuxiropodo.pdfIn PDF document text
    • https://bem-sa.com/img/file/vejif.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/a6e464e9aa8dc15dd4c8305ad9b30475/feludemerojizeporame.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/69999455388.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085eccbda977---7589437403.pdfIn PDF document text
    • https://mariapolis.es/ckfinder/userfiles/files/kevevumeratuza.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea455f634---43640224732.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c47190ea3---27129867433.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160799613661ad---62080544808.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/76257417887.pdfIn PDF document text
    • http://quatangsongvan.com/hinhanh_fckeditor/file/19064713987.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160efeaf2cd3e0---26041645098.pdfIn PDF document text
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/7f7d7066dc72c35f9085aec41618f496/lujade.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607db93ce2ba2---16046526360.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/08kqg7lua8ge017iubi865qc19/sonodobapagomumubose.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3680a77c93---770223703.pdfIn PDF document text
    • http://championsview.net/userimages/25102481704.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///baxidifakifuburube.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=introducci%C3%B3n+a+la+econom%C3%ADa+macroeconom%C3%ADa+paul+krugman+y+robin+wells+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_off000114cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE1 19800 bytes
SHA-256: 914015b9d762dbad0a0c7c1d6a16481d5f8755bf81044cbada7257f4e7ed7faf
font_02_sfnt_off00015f71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F71 11644 bytes
SHA-256: 0406b8f7212322252c19e99c53a0c39cae5347a92b4183e21ee9e084f831fc8e

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