Malicious PDF — malware analysis report

Static analysis result for SHA-256 85272d737247314a…

MALICIOUS

PDF

104.7 KB Created: 2021-07-07 17:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6b0ab8cb5197a8aefb5670a4ed1d0083 SHA-1: 72aaca47e70fcd2075d6aabe81eabd3ef9a5e9ad SHA-256: 85272d737247314af78090b3ec3a91707ba38f0d23c80b70d19e37cdb239e012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress upload storage and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's intended to exploit user interaction via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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://abnicum.ru/files/file/54865639216.pdf In PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/80b53067f435f34c6671befcf3106d1e/17763119447.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/38752616751.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b379aaa818a07ef2ab7141b79794ddeb/mitotoxij.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/qp56sj6jtnn6dsboeti520ho02/zurazefabofalugu.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/1od6dr7o6lot3dr9fcjnkmvj6a/95766273123.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/264829afa1c8c3851c88949fef1d83a5/78700222283.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/p7qf5eq7kk49fg2b9g620u4seu/punozesebolinadisoru.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/4430832250.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160714188001a4---82124500945.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/bomaxojakopitobugutizupe.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5e63d6dfe---tilolozukegasuvexor.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608945dfb370f---joluxijivip.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/c3okajpkk8mstkij0f3terjlap/92423007413.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/89983928268.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b68b99151fcb9255257d9d4201182a86/17528060479.pdfIn PDF document text
    • http://www.alborada.es/ckfinder/userfiles/files/tusewetemuperovubem.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/24432320551.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072f72b4de52---nibejuwovenufafademetol.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/dukadari.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/91354146933.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c70914a866c---17229252267.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3a27f8cc261454eaa93e37f2a41fd154/98927437795.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=enrich+meaning+in+englishPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0ED 23660 bytes
SHA-256: 38f40877b737e26b60bdd1301d3f697700bc3cc0d144c78b1457fb9a8e9a9cde
font_01_sfnt_off00012cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDF 10444 bytes
SHA-256: 6f54fc414bbc9d4f520f62d3b446da2794e686121b9eb3494ac5fc87442c42cb
font_02_sfnt_off00014434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14434 4372 bytes
SHA-256: 12403c3cb0014c481516cf81aa7c1d70c14169c7b8e35163daf76dfccbb8da16
font_03_sfnt_off0001543c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1543C 21868 bytes
SHA-256: 91923209a8816807b9ade8ab892b91cd3349921a641ff0a49ea56b79b793b6c8
font_04_sfnt_off00017ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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