Malicious PDF — malware analysis report

Static analysis result for SHA-256 505e48bc91dfc796…

MALICIOUS

PDF

83.7 KB Created: 2021-09-15 18:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c264913deea7db2304abb1161a7bdd31 SHA-1: c4cc2628597daa2c808a2db1c47e780c2393b3aa SHA-256: 505e48bc91dfc796a8239dc371b4627b096e8398ef13b190429c2d914649819d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to further exploit the user's browser or download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://huntic.ru/uplcv?utm_term=after+a+trillion PDF link annotation
    • http://keramann.ru/uploads/files/luxudirekiwopifimixudiga.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/bc0ql0hh79tf4cfbk50j5aec64/67802363301.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/goraxajamagesebape.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/baburok.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/lafilut.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/vufiguxesumolakar.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3e190dbe5---91563873949.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/91242907772.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/kiluvere.pdfIn PDF document text
    • https://ancoraeducacion.com/images/kubinejerokunukapezewi.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1e6b19ab---67418977337.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16141be04d77b5---damukawagijifinujiwukinim.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/10254249598.pdfIn PDF document text
    • http://synerfreight.com/syner_upload/images/files/julelakajarab.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/zuluranik.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/bolefawuzigudejetup.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/manuzozidejenanejar.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/18068842656.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e21b4e051---pigikapu.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/18325104184.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/munamukoxujorerenedobu.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/gusezapamujuraxesirad.pdfIn PDF document text
    • http://bushurov.ru/images/files/xavomusolurekanagipezi.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_off0000e3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 10020 bytes
SHA-256: 28e7e2a9171de789bd70b6489ccc5b110a3979d7f9cc2b8a5d5a471fc7b0f303
font_02_sfnt_off00011254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11254 18364 bytes
SHA-256: c557aacfd9ccc04710de4f287c34884bcc7c434a9f2a41f881a49ff0546a5e8a