Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99faaf18b45413f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-02 08:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0296280845886cdc36ccafdfb0d30187 SHA-1: 1010dbaee8c96426cd6a11b23676e985ae05cfbf SHA-256: f99faaf18b45413fd1ad6913ba62311a77155db31820c45495b932fbb96528b7
156 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The heuristic firings indicate it functions as a link farm, likely for SEO poisoning or directing users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, possibly involving the exploitation of PDF vulnerabilities or the delivery of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://philabc.ru/uplcv?utm_term=fundamentals+of+thermal+fluid+sciences+solution+manual PDF link annotation
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/079b3700a70d8ffa9b2822574cd1df00/37371822533.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/pimebodolatadisi.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/ditutegodologawukir.pdfIn PDF document text
    • http://esejsc.com/upload/files/23098198882.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129c7e4e3038---bipukujazezivol.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/31125366180.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210706175547.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/9lb0qla4a1atl8hioav5ph11i4/repoduzewesajevetinolexuk.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba4decd424---lixat.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/jupas.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/4967434365b0e1b963cb9bf2e86b4594/58317276866.pdfIn PDF document text
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/bisupedanavojisuzabeb.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0hg90bblfnem9fpb4ic8q9du7k/jixuzovoda.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161130f2f5e846---33534620716.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/seluzupajorimura.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3f58926d---gipijub.pdfIn PDF document text
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081310f70886---jifukufarudoxub.pdfIn PDF document text
    • http://afro-safari.com/upload/files/jokemanuf.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/bilojogiredo.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/sefimakurolokovomukuliza.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/95792893758.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/96167229168.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_off0000dff5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF5 10820 bytes
SHA-256: f1042c32069c813cc570cc0a366795e0e77aa10e6516a017b66e963c6a35ca8a
font_01_sfnt_off0000f8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110C4 18176 bytes
SHA-256: 6c20dc6cbc11755a471b82c7ed4d7c8fa7154420c1b381eed690e113856e84ca

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