Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd43877869936a5…

MALICIOUS

PDF

75.8 KB Created: 2021-09-02 08:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: fe3c3231fbe63fda2bef92bbbd3418a8 SHA-1: 9e643c985870be23503010f8cd2c6df8eaf3d42f SHA-256: 8bd43877869936a522cf0a47068143e12471f89014d2ac532824ceb8efcf6bce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript or exploit vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://synerhu.ru/uplcv?utm_term=waste+products+of+aerobic+energy+system PDF link annotation
    • http://muaah.ca/userfiles/files/minaki.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/borujijidilo.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/bisixegapuvitope.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/punuxak.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3b4d2c656059a0c1309393645e04c2f8/vowazi.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6utds75vku1fttdk7t5fd0bk8a/4665488908.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/r1tld5v71iber5on5ggmfue5c5/futuzizogidojobipesawiw.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/vavogaxubilinepusapezumi.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/5206578053.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d936483058---94055301949.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/riposa.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/sonarorirejimorufefoki.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/a894353b6e4d11f02e496ddee1036ccc/86964178279.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a09d579f5e3---45353210465.pdfIn PDF document text
    • http://cloverpark1960.com/clients/1/17/17c242f0968dc4bce059666b43fbd075/File/ramipami.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/kewopugaxelazilaxo.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/zupegez.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/panejepu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/69e4829bcad569f8b9c5da2ccbc4bda5/59528728321.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/rivagexerozevojeludul.pdfIn PDF document text
    • https://biocoils.com/img/file/peguvadixubozel.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210830122422105.pdfIn PDF document text
    • http://accronline.com/userfiles/file/lapiwunozajojerowevokij.pdfIn PDF document text
    • 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_off0000c510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC510 11264 bytes
SHA-256: e34b3f9b9f86c1aa12db4c0501d48759a3bf0d9aaa098637e1bba95d0369d371
font_01_sfnt_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 16452 bytes
SHA-256: 1f3a461f485f0bcf9f361e6a3adaed4038b3fabbc7dda61a8be5029da766290f

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