Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8eab495417c850…

MALICIOUS

PDF

78.3 KB Created: 2021-09-13 06:12:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4ee44d9fdc0146e18f096908814775ae SHA-1: 234c4c33a92d8c585a96a282b5c4636c3153a5a2 SHA-256: 2d8eab495417c850e93fd9f6766568d5d7f673c3e5acd583f27f3ddde1f38d8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely to host further malicious content or facilitate phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the presence of a link farm on disposable hosting, increasing the likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/43b042b4c22b6317a45aa9828e867909/vamisa.pdf In PDF document text
    • https://truonggiangcompany.com/userfiles/file/83783362775.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/b1054603222b543891fefbbb06c3faf4/nesejolevutazapekit.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210910_B580ECB02D3691FF.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/e3f398c9abb14c6c670faa03b1dcf48f/5439995955.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/60118438983.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/94231606161.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/43607638449.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/jalixinesemobikasudate.pdfIn PDF document text
    • http://machin.kr/userData/board/file/84801311351.pdfIn PDF document text
    • https://ever-progress.com/upload/files/sopuwubitaxupeso.pdfIn PDF document text
    • https://people11people.gr/uploads/File/zasigomezefun.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29b46a23e---lamugoditolowefurixedato.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/numozufoferar.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/28116951762.pdfIn PDF document text
    • https://kalimati.in/userfiles/file/savutixonakiret.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/81907089297.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/runugudovugikomuvup.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/wosubapasixej.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/96278409578.pdfIn PDF document text
    • https://alident.centralcms.cloud/galeria/files/rovidonibetivux.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/karigumirumekafula.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/52493628891.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=coins+master+modPDF 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_off0000cb99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AB 18672 bytes
SHA-256: 26486023cb428ef46744ad6270350180d88c4324064df80c2cbb1771fdb1421a
font_02_sfnt_off00011471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11471 10392 bytes
SHA-256: f9063fe80410b101e78ce476589b5cbd0d8e172e99a90cc028770d18fd80a4a0

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