Malicious PDF — malware analysis report

Static analysis result for SHA-256 05fee8b6883b8924…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 05:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4a75624d2b0635be2c31ed06967c5fcc SHA-1: cb4f208b27e88360ccbc7c97bb8efd114702ca85 SHA-256: 05fee8b6883b8924f4f8b763dfbf6b5325fcc446e5baf275c7b22e0f87a12c8f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly suggest an attempt to redirect users to malicious or phishing websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://medvor.ru/uplcv?utm_term=good+answers+to+difficult+interview+questions PDF link annotation
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/95d1c62ee13441dbecd535f2572b904a/61946895997.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/libopurimexuzotur.pdfIn PDF document text
    • http://paillasse.hu/userfiles/file/zixavokidagujufuw.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c177be84747---5304933009.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2c7206d44---sutuxaxiviwu.pdfIn PDF document text
    • https://www.micron21.com/application/third_party/ckfinder/userfiles/files/rebusupar.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/75712036d40e826c7ff9d27bee69d235/waruberofebuxan.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/88175103832.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/wemobitepelos.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/ruworaxibatozuvenigeni.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/36942372742.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/691bc620be48714ebb437a795500e605/juxaponajukipegitiz.pdfIn PDF document text
    • http://wsospice.org/uploads/userfiles/file/file/zajufok.pdfIn PDF document text
    • https://mmszke.hu/files/file/93491975523.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/korekuv.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160839283de962---jakujax.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62456011c4---72009482836.pdfIn PDF document text
    • http://aiken7050.com/clients/5/51/510ae66c864a6d23552e02d1b5190e2c/File/43334868806.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/kotuxegisi.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/67109256209.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/gerora.pdfIn PDF document text
    • http://bscartridge.com/pic/87798724422.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210713161730.pdfIn PDF document text
    • 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_off0000ddce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCE 17452 bytes
SHA-256: b4f0d0b70c4d00968194430bfe35bd55997eed1d811189eba7d4b6eece18586e
font_01_sfnt_off00010ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FC 10904 bytes
SHA-256: 93d69ed3f86707875262033ba0be577d4ba30b8d5d6743747f2a4cddf05707a1

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