Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c19a52b8fce11a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 19:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b14f861081307cd68ac2434831b641cb SHA-1: 9f3622c78156d6b00d2825b3dd9568aa228ed928 SHA-256: 41c19a52b8fce11a6ee351a61b00440bd1a453e513b20d1abb519cd8a8810c36
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=marketing+strategies+for+service+firms+pdf PDF link annotation
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2d4aa46a4be733402a43441d408e3edf/nosuxob.pdfIn PDF document text
    • http://ipai-bg.eu/img/file/raputilurokovenetupusilot.pdfIn PDF document text
    • http://dkind.net/userData/board/file/pukizomejebubuwase.pdfIn PDF document text
    • http://kunjipsc.com/uploads/files/jawuwiferale.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/14562516589.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/36709855009.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210907_182252.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/2387150536.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/gasawodazez.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/85485160024.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/54940779454.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/17953394248.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///pibamofuvo.pdfIn PDF document text
    • http://all-paca.com/ckeditor/ckfinder/core/connector/php/uploads/files/butivepaxabo.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/vefabapugadokowosuderes.pdfIn PDF document text
    • https://www.casestilistas.es/ckfinder/userfiles/files/40025951954.pdfIn PDF document text
    • http://futuralagoparking.eu/userfiles/files/misakujoremerufesof.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc340bbd8a---zenezijalenewaz.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139616059378---74718081222.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132523dba1fd---9936452410.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/tonexu.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139eb39a158a---vumagemapemibunimokev.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/kobinixazozegilofupax.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/memep.pdfIn PDF document text
    • 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_off0000cb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB19 16628 bytes
SHA-256: e517af9cda48986ddd536aaa9397e3644e8f8743c3d61c892773006330bd83be
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 11068 bytes
SHA-256: 3611d05a2f211a383333c68a75196344ba00b5daeaee85d07fc9f47c94ffe8de
font_02_sfnt_off00010eb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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