Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6285d3653f2ed88…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 01:15:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dde520c1e5447a6aff6005af726d709e SHA-1: 42c54b107647fbba0457e881a0010b2478b98759 SHA-256: e6285d3653f2ed88b5feb901107920a73826d184677736c7a2e41c9e23abbe40
176 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document's structure as a link farm, combined with the URL reputations, supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://krafteco.ru/uploads/files/xadagunefosijoduzabupal.pdf In PDF document text
    • https://www.ojchamber.com/ckfinder/userfiles/files/xabis.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/22353952568.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/jogulozowu.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/2909563140.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/pebewo.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/3492811981.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614084ebba361---99254153590.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/d5d11acfe3186bdf7a964034f74662a4/pidotasibigorib.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/rilizofip.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/defipopatolexazutuwutefo.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/6141be34b5d62.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/zufutiw.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/kazegiterulow.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/betirutuzuwipubako.pdfIn PDF document text
    • https://aakritidigitals.com/userfiles/files/negisib.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/86051866103.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/91869810319.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c4cfd490e---76028071131.pdfIn PDF document text
    • http://elandtour.com/FileData/ckfinder/files/20210919_688A0746032496A2.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/vinifo.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/xudej.pdfIn PDF document text
    • http://simoncaulkin.com/images/40670743082.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161475cb4e100d---67416930233.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/10701680379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=dual+space+multiple+accounts+and+app+clonerPDF 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_off0000d95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF173 10776 bytes
SHA-256: 2f41ed9fd99c7898dba3c9e10e59e32f15fc2ced42bcdb4f8aef81e45c113c2f
font_02_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 18564 bytes
SHA-256: a6b8b33618747842ec79d7338b99b44143d599b5fdf7b9771dbcca659b9250f6

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