Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3afe8fac5fc04ae…

MALICIOUS

PDF

87.6 KB Created: 2021-08-07 08:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c823489b68b9e2ce6601b6952a3e9981 SHA-1: 4ab46d8b3566f5f13e98f7d8d856d2e92103bf5b SHA-256: c3afe8fac5fc04ae3dd9c681cfc63267429026221c6e367405e416a08ea5600f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the PDF contains numerous links pointing to potentially compromised websites and disposable hosting. The document structure suggests it's a link farm, likely intended to redirect users to malicious sites or for SEO manipulation. No scripts were extracted, but the presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/3516abe3f007f2e0726fd0c3c1ddeecc/pujaterelitikorejose.pdf In PDF document text
    • https://gilbertems.com/videos/file/juxawujipija.pdfIn PDF document text
    • http://ibb-online.ru/f/file/11950115343.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/048a5aa67e2d0db038102ef8d1c60f4e/52538396764.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/fumruilfa2co3qcfandm573juf/wirivenojukava.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/sowegexelumom.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/97530280311.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7a70ddce9a---76271351229.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/rekulo.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/66262840925.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c797147e486---gunokugoba.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/37880427129.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/88271438361.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/3071d1b0bcaaa496c666d5a612be9fbf/gudozipowavaleleku.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/muwodajoxowilig.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/24046236867.pdfIn PDF document text
    • https://isleo.com/i_photos/file/volukusunom.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/onf0veoe5mu19uov1nbvvv3htc/11196370937.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/jixinesovosan.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/93360025711.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/24597394787.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f7c02b68ad3f97428d2306b73eade8ba/78108266990.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/qhmf2eajb2ig8onohqaku01ihu/48062233420.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec75b2622c---84873916404.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/19250194748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+enter+cheats+on+xbox+one+gta+5PDF 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_off0000f1aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AA 10824 bytes
SHA-256: 75310a4ffb0f02006db981832d3f35011930afc2a218761f84d86246f64e9c1b
font_01_sfnt_off00010aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAD 18016 bytes
SHA-256: 0fc3f38045bc74c0d58062308cef93ba7c80beab5d23850ad4d7f1938ed297e1
font_02_sfnt_off000138a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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