Malicious PDF — malware analysis report

Static analysis result for SHA-256 b239eaa16a4a5faa…

MALICIOUS

PDF

83.8 KB Created: 2021-09-05 06:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0c79a6361ac850e34ee537260b4aa630 SHA-1: 8d3440adea15b008e184a8ac6de413c026f67a88 SHA-256: b239eaa16a4a5faae652d016530a0722b75bf88f6be42b9ac264a6c56ea56b8e
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple compromised WordPress upload directories and other disposable hosting sites, indicating a phishing or malware distribution attempt. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of numerous external URIs and the nature of the hosting suggest an effort to obscure the ultimate destination of the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garnizone.com/userfiles/file/86295237258.pdf In PDF document text
    • https://kuraniterbiye.com/resimler/files/zofekulejogojagujiwexifuj.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/a07e82d6eb1b8e0726b961cb94b5ca2e/xegapileregox.pdfIn PDF document text
    • http://mega.kz/media/upload/files/10940884757.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/39166169650.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/39472499213.pdfIn PDF document text
    • https://andrejc.si/files/file/zugegigadalenigamadog.pdfIn PDF document text
    • https://soechi.net/userfiles/file/fadibumetufufunajaxuniv.pdfIn PDF document text
    • https://ka-base.no/images_students/files/mixobewakuxobogogiwe.pdfIn PDF document text
    • https://justforjetscatering.com/userfiles/image/files/sipije.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/aat126ca3fhho0hjtg0lis5vlb/wijudobobomulerajozogi.pdfIn PDF document text
    • http://autofox.lt/ckfinder/userfiles/files/jixalajerodid.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s2vf6ttcbkv59stqilthrkip34/68549851647.pdfIn PDF document text
    • http://incucinaconalberta.com/userfiles/files/redegavilalirom.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16094b55b7ac32---movisododenokabanu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/0b4af5907187cddca456527cf6badf83/97611871994.pdfIn PDF document text
    • https://ms01bet.net/contents//files/65292863774.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608f41c85bfe4---4179017986.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e86b186cf---12143889746.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/90772164357.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/73522715330.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e6893d406---katarizolizalipa.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0144aacaed---90524655510.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=haese+mathematics+year+9+pdfPDF 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_off0000e1ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AD 10888 bytes
SHA-256: f5f51f9440c0f75ddbb44b4ca9cddaf8becb3d903a7a7d1b1df1eb1e12869127
font_01_sfnt_off0000fada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADA 17968 bytes
SHA-256: fe2ab95d044449035d6354350881ae44bf09a83eee37645d816492da1029120d
font_02_sfnt_off00012973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12973 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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