Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4085f248aa72ea6…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 06:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c9df6f80421fc846ff12f0350d6fcc14 SHA-1: f71ccc0c4dd5239633a2c0f27da4fde657707f59 SHA-256: c4085f248aa72ea668cc3369f22e0ce2d89d9b4ba405a549be4a42ae16c11bb0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are identified as a link farm hosted on disposable or compromised domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://medvor.ru/uplcv?utm_term=86+honda+fourtrax+200sx+manual PDF link annotation
    • https://berbagiangka.com/contents//files/bupezaxisasutupakop.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/61758484787.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/45133698203.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/p4vd3sk7u4nve6s41k2nkjit56/57307672210.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/82714494951.pdfIn PDF document text
    • http://ty-int.com/files/files/xirugezibaloganalibu.pdfIn PDF document text
    • http://vickerycarpet.com/uploads/images//files/gumivubejevikirimug.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/tabotekoru.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6eceb450---91761976496.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/4nrvjtk8ro471e520hhs6elr1p/tomuxalujadopomunabufi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607378a10bc9f---bojuvutepuwarobelexot.pdfIn PDF document text
    • http://sergeybazarov.ru/file/zodatapabekodisinin.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/3598842756.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa0c3213f3---fejil.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe91dc3485---wenaw.pdfIn PDF document text
    • http://leguido.net/files/papapiteges.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160da23f14a49d---54961801047.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/mexunozuwixorolagivaw.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/5dcbb75f2607b63128c6925a3bbadc22/15566690654.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/83554485459.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/kusaxadatosolowodebud.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/93183728795.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/dunilajovoj.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_off0000d393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD393 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA5 20052 bytes
SHA-256: 78595e16b832a44a8e9b1cbee003a3122b5f3c57e3844db93adcf4468cf4781f
font_02_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 11116 bytes
SHA-256: f94e0b1e9fd90f64b20454576b21e02897dd88582fe500c65ac3c6eb36c352a7

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