Malicious PDF — malware analysis report

Static analysis result for SHA-256 984f5beeeb23cc7a…

MALICIOUS

PDF

84.6 KB Created: 2021-09-06 20:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 991f92144ed7f5318a428cfddcead90f SHA-1: 1f250b2a83d26042d27818ebd158e76380b97a5e SHA-256: 984f5beeeb23cc7aaad47094fcf1d40003406a8dd4a13cfe4e5af87ab489bc20
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure itself is also flagged for containing duplicate object bodies, a common obfuscation technique in malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 https://immo-macedo.lu/userfiles/files/nufifixodebuxazomuren.pdf In PDF document text
    • http://interno-kazan.ru/upload/files/93992552730.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/pedevaluwufimovi.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/marikakevu.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/39c771987bbb691661d8753a3887f0de/gujotebiloxatezipakuko.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/8494967412ce268ad1545c039286bf1b/17339934986.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/alb0a0mi5t31sbj7brsa49us9q/nonodubikanerudawiw.pdfIn PDF document text
    • http://alliance-vietnam.com/upload/files/koxebetumew.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/5f8f2fb416d44b1e009611df1b188379/totimixadibadidupejixiron.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/wixelulam.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/26450133984.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/pimufozurula.pdfIn PDF document text
    • http://varanini.pl/userfiles/file/lodinoditulokujefuxaw.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b5766ccf724f339860e021a04d32a3f7/magelegasasub.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/hb3i2bs0q3qtrqvt2qm67q54f6/giwusilifefuvo.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1610bc7a348180---43523798792.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/51761747111.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/jupipenes.pdfIn PDF document text
    • http://ipmarketing.net/userfiles/file/fivowapiworaze.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/655lnnj9hpcpe9tns70cdbtolv/84380350965.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/34246112793.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/wojubiregapazatape.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/f933f087f5dc49fbce6a2b7d90dbed18/71981233683.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/449087a69bbf173fe5633cc65436a86a/22747773143.pdfIn PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/43fb304c5baf0020e6b406ab2e6da883/tivesesidigunakutot.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/89807693625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=fraktur+pdf+uiPDF 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_off0000e377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE377 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8E 10092 bytes
SHA-256: b6e57ab7843765d592d3d0d4677b6cf53d4f5040adedbb8d525958f235f19d80
font_02_sfnt_off0001121b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1121B 20036 bytes
SHA-256: 989abf0776099ea3db64aaa8172fbeaa84981bc510de9a086223bc76d9823146