Malicious PDF — malware analysis report

Static analysis result for SHA-256 1009bef512ea3fdf…

MALICIOUS

PDF

73.7 KB Created: 2021-09-03 10:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8241f0487360609c90a5d995a577656a SHA-1: 349d0e889e588c5949fded9b03c957b49b3a915b SHA-256: 1009bef512ea3fdf6c51e519db3d08577f817661aab05a5457b62895e325d2dc
184 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection or execution of further malicious content, contributing to a phishing or malware delivery scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4fc4fb7bcd4bffb4fa3cf14812f22cee/gujizedofobarava.pdf In PDF document text
    • http://geostudio.eu/userfiles/files/50825620793.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/nosupusikisaxi.pdfIn PDF document text
    • http://ciaooo.ru/uploades/userfiles/file/zekowigodomowuvagoxi.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210812_5ED0C054765429A0.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/5ba1e8023dad822f167bac0f3aefe6ec/78942741312.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/98673003799.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609853cf78c51---2210669131.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/57036060202.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/30044487190.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cb061ac62b580d23477de4f3082a61c8/zotegorevosa.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/14764560154.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/tezugagido.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/76b4a6998fe9e1f7fd4e72cc59905df4/mubaf.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/gegejemadowalexetaxiti.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/8df1d72c9d3c6894642e9ad097f64a27/23815939724.pdfIn PDF document text
    • http://asfalon.com/__files/file/11775107157.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/0c1ac706a725c72fef9912c4dc536d39/dodit.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/f8h1gj0midam1sd30hktqgkkg6/4281327116.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b393171a5734e9723faa2da151d900a4/43074748878.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/zogezojikezugixokavu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/23542617406.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b62f8409b23---veruzapuzuwe.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/sonavitaxalotanonuwok.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f5f83750f1c7d93896ff6207da5f6a47/13069654872.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/f4tg72jde120t8g8dhg34mf42s/siduxozenogisomuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=biologia+molecular+celula+alberts+pdf+portuguesPDF 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_off0000ba6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD286 11152 bytes
SHA-256: 4b94f539d699c4323dab9e2d49e86297902e0072ed54e04724ba772af42ea1ff
font_02_sfnt_off0000ec3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3A 17156 bytes
SHA-256: 696e71419bd5feafe7652afd9777307a9e40362ec00ec5c924b9527c756b9d7e

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