Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfdd90ec7914447d…

MALICIOUS

PDF

79.2 KB Created: 2021-08-21 06:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f1c184f3d174eeb6322a527cc33c10ca SHA-1: bb5ad1da09c9c8940609ce95539a48a0395ff817 SHA-256: bfdd90ec7914447d96ae2a3fa4837486da270c85dc9a123553019ea2b32c531a
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://mitsubishilongbien.vn/images/ckeditor/files/98623930649.pdf In PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tbli9oq4aluvl35jsc9tnq0bar/sekev.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160adb717b8c44---lagirevedop.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/23423826163.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/uripcmpfh1n587pmd14lh02680/zifumoxosir.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/75603524807.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/27978694367.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979bd463995---zolavaren.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0629a7a22fa8ea1f9966a1a721645ba3/wefezuvazidubokugumofamep.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a441c94931a---bifusimopujoxokarexu.pdfIn PDF document text
    • https://tavio.ru/files/file/kewikibexududavogas.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/rodizuzulur.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0b8c9c966---69469436086.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/lopafikifonozinivusogexap.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/99350393637.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/57231648243.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077157ba4484---tijajegogilirujuvolojib.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/90336742165.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/98622502091.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/hpt9312fvho7q2d7h2pghpbqlu/bunapuwopalozorisi.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/99115338544.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/31485469456.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073df1ec048e---wepikagebenogewigezo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=reduced+row+echelon+form+4x3+matrixPDF 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_off0000c87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE092 11156 bytes
SHA-256: c71124dfd90ea4e4fbde5c61e06bb3f21b7c17a9bc2030a253bbd88e981e0dea
font_02_sfnt_off0000fa8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8D 1736 bytes
SHA-256: 1959fa96e36b37e7cd8605509ecd859e408edd544d611ae81e3dd15dc4a15b92
font_03_sfnt_off000102c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C8 16772 bytes
SHA-256: 240d0214d1c21e3dab51fe2359123a29d8e744e8c827f02ed2fe46ac943d71ef

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