Malicious PDF — malware analysis report

Static analysis result for SHA-256 fccfee06d03e07a2…

MALICIOUS

PDF

84.3 KB Created: 2021-08-20 22:22:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c83634a16aa2820ea371f4c530b69cd7 SHA-1: 5a77a5056286eb718e01bc091f1a5df54b846de9 SHA-256: fccfee06d03e07a2a34d7ee86fc90c01b2fcc3c5fd3ed6b71957b41175aacf09
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to various compromised WordPress sites, indicating it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous unknown URLs strongly suggest a malicious intent, likely for phishing or distributing further malware. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

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://llux.vn/uploads/files/8339385542.pdf In PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160abca672985d---82003998004.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8442ce3a6079251abdad9a2a23a0b861/xuwenetazibojosebe.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160b737ff1564e---6593671950.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/33888521885.pdfIn PDF document text
    • https://cengilli.com/icerik_images/file/banobikonetofavagutovi.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3dfe428175d01e2f5651d773d40b6781/55444522081.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/dunaoest99f1ekjuvcpaf6dtt2/vevotoxopar.pdfIn PDF document text
    • https://delphin-restaurant.com/ckfinder/upload/files/liguwunoremudun.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/nudumaretewitemejo.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16117e7afb56fe---zazobuvonidi.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/nodumerumilux.pdfIn PDF document text
    • http://prosquash.by/data/romabutilud.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a7194b4fd---97690728995.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/76785054630.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/186675c77d26123fa1cf0e5b38f73d67/wewemesurikikitukarizamet.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e35a6384a96087c25e47f11a1d91d7fc/vexinusofafixaroxizazav.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/nolanawuzebebabu.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/80629410533.pdfIn PDF document text
    • https://sinarwaja.com/account/files/25708670874.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/4b15f8ace583c55bd859d30b21e7dfab/61654577359.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/051b2ebef6558f3d3a13791185863ae5/podanip.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab3fb05ba2f---84641753997.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=globe+light+bulb+3+packPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE295 19036 bytes
SHA-256: 577b19b935fa5cf4d600a222199e204fc109fd4ea4bc6665b1b92f38bd700ed8
font_02_sfnt_off000113b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B2 10824 bytes
SHA-256: 347018cba982b609de542b162129cfc545d16174249c7198efaf004431f36a2a
font_03_sfnt_off00012ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA0 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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