Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc06dd883d2a1fe8…

MALICIOUS

PDF

97.1 KB Created: 2021-07-28 04:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b26ffb1ac79490a3cdecc3b2dd5113cb SHA-1: 532a5e619eebffa3e1bae09a53257d76dc2ef1fc SHA-256: dc06dd883d2a1fe82b68709e6f7c67bf719a46125e1eaa23247f2b581258a857
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to link farms hosted on compromised WordPress sites. These link farms appear to be designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, and the presence of link farms suggests an attempt to bypass security measures and deliver a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087ad341cf62---40887915685.pdf In PDF document text
    • http://ibtaker.ps/userfiles/file/91369106730.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210703150025267.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210601125502.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/tilumakusesogixejap.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3efe5e4c---ririvobokaxe.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1e0476fb3---18726897501.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/70275331278.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/86830118699.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kalekarub.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cd2d9341098---69350802337.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/42959638626.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607accfbc3978---17657722922.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/nedakododijov.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d1e7e26f5---kubew.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/hspg68svdip35qet4h9v1ev5ul/dazaridakadutomofalop.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/238ec9cb37fc29d696378a8b6bf2183f/bajev.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda2626cffa---nizemuxefumezaxanazo.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/e05430qmnrlup8ae9ds6k15ioj/dovunezuveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=does+flat+tummy+workPDF 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_off0001179e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB0 17168 bytes
SHA-256: 6ed028ad0c748948b7b977bdbf08788fe7aca500bc9e675ba84a6779da28e9d7
font_02_sfnt_off00015c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C8E 10572 bytes
SHA-256: 56b9f4dbf15c085ac330dc1ca4f5472664d8296048efb3dc9616c16812f4ae23

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