Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbe3b0502678666c…

MALICIOUS

PDF

78.6 KB Created: 2021-09-16 03:36:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 512975130fca806da8d232cb622ac605 SHA-1: 9c324108eb05d542a3afac859248118d094df849 SHA-256: fbe3b0502678666cf2dad723472ab4f3fad8db0b097de27c28e3233d84798a39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://tensoinox.com/userfiles/files/warobajut.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b702e12eff---kesuzuwisekog.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/799647361.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/zotutaki.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/97566433666.pdfIn PDF document text
    • http://xecuoihuyhoang.com/uploads/userfiles/file/91058319686.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/tizavewutiruno.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130990fc8839---rajinemexawakomireberal.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/45840220952.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/kenidaneboxoweworefuta.pdfIn PDF document text
    • http://446888.top/userfiles/file/fafopusabeja.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/lagedetukugelak.pdfIn PDF document text
    • http://slhospital.com/upload/fckeditor/file/navonomipu.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/zesuxeneboxodune.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210916052015_ku8wc8.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/40508204458.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/4df6som6ssjaedd59u1lv1p0jh/tuzenupawu.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/zomegaboliviv.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/kobetidajufeloj.pdfIn PDF document text
    • http://punaide.com/userfiles/files/winovaxozaxovedodolobiget.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/72701677752.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/46037728124.pdfIn PDF document text
    • http://www.oomewatersport.nl/upload/files/84403166557.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/nibewejepota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=free+iphone+giveaway+2021PDF 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_off0000cd7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 10756 bytes
SHA-256: 50ab233ae5631ded4cab2af6223d95dc93f0ab652cf478281dc29d67b6bc283e
font_02_sfnt_off0000fe52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 17692 bytes
SHA-256: e0831a1af923ec979e67e4d262905082a2dd1fa3d6b1d8227d5aa7d7ab7bba48