Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ba12a52c098b89…

MALICIOUS

PDF

82.5 KB Created: 2021-07-30 12:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e23c617bc8fd576322d5f417848732e2 SHA-1: 17230cd13587dc0e56d5c2e381bc70e78e3fd1b4 SHA-256: 25ba12a52c098b8955204dca2d41317996b903755b53c7ef4065134063f73546
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristic specifically highlights the use of compromised WordPress uploads for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://beiks.info/public/file/46266430449.pdf In PDF document text
    • https://pediatricpotentialsnj.com/PP/PPpng/files/wabalirititanezakejopu.pdfIn PDF document text
    • http://bvsaigonbinhduong.vn/uploads/files/luwoxamisejuxafunigomev.pdfIn PDF document text
    • https://roc.mn/uploads/files/68788127884.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/mafogurujulumonetara.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760320b330f---kujomi.pdfIn PDF document text
    • http://bluebirdcanada.com/FileData/ckfinder/files/20210603_7D6E766E62325422.pdfIn PDF document text
    • https://rjpexport.com/files/xurekiduvokopapijadup.pdfIn PDF document text
    • http://latexindia.com/userfiles/file/miwurawevuviguvefo.pdfIn PDF document text
    • http://chinamakina.com/userfiles/file/pipifozifubise.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/861244f6c9a18b1e809b00bc9017e48d/1115103348.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/8b9afaaf4ee730cf85ab1c6c553caeb6/3286494512.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/fuwireviwopafurevobotoj.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/wakopofiwubakin.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/pifomekemumanofojuf.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cad5e7d3e39f07882161af1cb985740c/fajog.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/xesitemufaz.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/1443b41525b36408bcb08f4e168960f3/88542415818.pdfIn PDF document text
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/zekuvoneparus.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/tirapagirofu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/18131151961.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/dbc8051012d943f1f895b3f8409bdfa3/97230991021.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=cuaderno+de+actividades+espa%C3%B1ol+tercer+grado+primariaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA19 18176 bytes
SHA-256: ad6e5538ccc9dee6e6f8f2933e2372b18198642a49b1ec5a361e155e016a4b7c
font_01_sfnt_off000108b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B7 11260 bytes
SHA-256: fee2ef57cb5b33618d9e0c90133aaf508a58b66b5ecd0b6c8b284f541ecc2e3d
font_02_sfnt_off000122b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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