Malicious PDF — malware analysis report

Static analysis result for SHA-256 87a1e26eab26fe13…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 23:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d889ba995185a7ff401629097fac7490 SHA-1: 86bbbf7fdf4d68f19bb767872f084dcc1724eaea SHA-256: 87a1e26eab26fe1387481e4c9371d9867f4a34b8472e6f775094eb916f7212d7
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of a link farm and the use of compromised CMS upload storage are key indicators of this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/70688425625.pdf In PDF document text
    • http://diakmelo.hu/ckfinder/userfiles/files/kopobikaretolubat.pdfIn PDF document text
    • http://splogservice.ru/content/file/vajevav.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614117d7e1207---67740954314.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/tujokewoxixasezebagan.pdfIn PDF document text
    • http://brno-skoleni.cz/ckfinder/userfiles/files/45684676114.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/jefusa.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/xizarogoloxi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16144731c49cee---95737650310.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/a1c42f6ec429d68f6f53beb5d71ad2e5/48876084146.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/pidofamapak.pdfIn PDF document text
    • http://atrsara.ir/resource/files/11736739177.pdfIn PDF document text
    • http://icoenergia.com/userfiles/files/kedumukovujerutur.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/tanurorupuzefenider.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/fotuzatoropekosofad.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/luburegijinozixavuvopezu.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/bifofibesivumu.pdfIn PDF document text
    • http://standdominica.org/files/files/29019769288.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/4049370998.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/5186120657.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/22815356530.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/nelatuperikijunuvugimez.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134100e760af---sibifiziki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=fnaf+1+download+apkPDF 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_off0000bf49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 20012 bytes
SHA-256: e0bab877a4cae4d06dcc74227ab03f25d956e09498a0b81cb02b07ba58419299
font_02_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10108 bytes
SHA-256: 3278fba1c2c7ed5f1c2f7c039b63cf9d77f8a90b75e3e85a2296ab5c78bc30fb

Open this report in the interactive analyzer, or submit your own file for analysis.