Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dd3d71347fe9fde…

MALICIOUS

PDF

95.9 KB Created: 2021-08-07 18:22:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: df97ef13403f6385b875f1458b620723 SHA-1: 59ef45fff3ca7f639625a00ae8732dc5d72e2963 SHA-256: 6dd3d71347fe9fde573176a882733ab4e46cdeaa4e5c608484ea7386f4dff8af
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The file's structure and numerous external links align with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://studiocalderini.it/userfiles/files/penobujokemolutaw.pdf In PDF document text
    • https://tectrongim.com/uploads/files/14428802461.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/dapugosavajatepokezipoku.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/1643b14a47094c4df82ed43ea3b22484/puresutusedegulise.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/54140836935.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/47491030407.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/valogetomowik.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/3ab9811b2ea103f8fcbfd976f17a4126/85211608208.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609db1513bcf7---wasogozitipobuwedadi.pdfIn PDF document text
    • http://antonioruizabogados.es/userfiles/file/15844498147.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/mokesul.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/batutenowuvemexodajezaj.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c745247341---95654919732.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec6a7c7948---sijege.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6ce6f012ea---27633086321.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/fajipike.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8a794c6dd---90901108841.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/b35c178476689b7e3d13c75f12636ed3/87345385471.pdfIn PDF document text
    • http://skncn.com/u/files/nefegirakimogo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ff44b0e4ad693edcda29fae57b09eabe/72607619050.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/o8njg7kb1j0gonbarnbqv0co0l/japekazazikixajogepok.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16072f3fecd7d3---86295238821.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/gotarobijodejugugudikeniz.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/46184533562.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=biochemical+characteristics+of+bacteria+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_off00011082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11082 10976 bytes
SHA-256: ab9f85d6b0cc35346dfff482cadab786355dc858dea97f6aeb7c25662a869a49
font_01_sfnt_off000129bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129BD 17956 bytes
SHA-256: 8d2d9f765345bbdec09cf255222a4ef1e69c7544e10965c41bcac00c1f4f2c57
font_02_sfnt_off000158a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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