Malicious PDF — malware analysis report

Static analysis result for SHA-256 671aaefc01e815b0…

MALICIOUS

PDF

88.0 KB Created: 2021-07-02 21:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: da3c392d96599e7ae33eebda4a611bbc SHA-1: 5e12d975294b5711b70c6ff09b43daefe3e658de SHA-256: 671aaefc01e815b0224baabe3bef43194d6f984bdcc004b7ca13fc7f5011e7bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also includes numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bigxra.com/uploadfile/file/2021061907421373499.pdf In PDF document text
    • http://www.tramag.pl/upload/file/1964213437.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/tidav.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8dis796vg9pvpgsr8bdut8b8kq/42469806458.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/zuzavemi.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/susudurewexidova.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/85016023646.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74cc19b1e6---20110892547.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/bc3h7p7lh2hp1j8k58bt4sldk2/13026848419.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/83173fa500797012985fd3c62ab563b0/pegaximi.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/31963332565.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb304af25ef---bolowanobedazorolabo.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/xukidugudipinat.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f044fe84d2f77781b935a341236a74e2/bolekajofamunalefugiz.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/10109482222.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34227eed48---ginagupupozegepe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842d090c998---83220149289.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/f716644b56a0235848e0cc42fc6ad028/lesojofafovezir.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/cahoh8vem26r1h65khnpas23um/84534837606.pdfIn PDF document text
    • http://olympusflights.com/files/files/54289567022.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/ribabazevorafutelepegip.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/57406825334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=word+meaning+in+linguisticsPDF 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_off0000efae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAE 19556 bytes
SHA-256: ce50300b734dc485c5ba13b4f9998203bdb5f8c0600bc22e452fff88c9ab8e51
font_01_sfnt_off0001220b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 10804 bytes
SHA-256: 7a4d8bb06f253821d416d58c523792ac961c7961c9018098f83a0b9ca5764fba

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