Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcd596c31e88b3a…

MALICIOUS

PDF

168.9 KB Created: 2021-07-03 21:17:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 37f257f60eda33d9f57bdefe42f77ddc SHA-1: f1bc3973d0c5dfc473da335ee128c593ee8ba97e SHA-256: efcd596c31e88b3ae82c5d43c57c6c8b560f4db1596c7a0d8ecc76c6a9ef2c15
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest this phishing or distribution vector. The ML classifier and ClamAV detection further support the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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://sluchatka-shop.cz/files/upload/files/5414305415.pdf In PDF document text
    • http://dralituncer.net/userfiles/file/gevaxorav.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/pt0gp7r1akmn8vjkd9v3iknd00/jujexerumago.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081dc2467320---49213049647.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4f5c9660a---ribukumuve.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b837137a6a2---xexeziwadusavaxo.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/aced2fa7da3a080d406203cdf97b780c/20868986618.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/c6faea7feb17f9adacf35ecd0cc7da08/88635077628.pdfIn PDF document text
    • http://bociany.sk/media/file/jeboxitid.pdfIn PDF document text
    • http://santeh.md/img/files/jisugafojidug.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/65305056046.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90d1da224---xavanovexamuwowezegozu.pdfIn PDF document text
    • http://planbmedia.hufiles/10268697716.pdfIn PDF document text
    • http://sunnysidehighschoolclassof59.com/clients/867562/File/lopuvaxeror.pdfIn PDF document text
    • https://rinducm1.com/contents//files/75704760447.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/futajowulorabatejot.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/27694983163.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/denokumumuxos.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/51609924468.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/lekabejitoro.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210608232220_1361896416.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/c654d302cb598a28e82081b1dc2c678e/788368592.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/44132451399.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/c401248a97374836547f0382c0b32e93/mofatudisewofibeli.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-21/20210621030622892775.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cold+and+aloofPDF 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_off0000ff37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF37 9788 bytes
SHA-256: 0bdd3e677d8408c0e3898aa62f7a1b721e714e11620d7ba0602b21738222a10d
font_01_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCB 127668 bytes
SHA-256: 1ef4bcf1f24b179ceff9b0f69651aae7db443833ab4a66de1b3678091d0eea69
font_03_sfnt_off00026b79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26B79 16392 bytes
SHA-256: b9617930d2f2199675db114a4732e3c7c59f8e514da2f2d1319fd08895975ca1

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