Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e2db6dba3a3bb70…

MALICIOUS

PDF

81.3 KB Created: 2021-09-02 03:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: d1ad924856c6782cb9188fc05ac3f275 SHA-1: 963c3965d03484d15fa9e627c722631dc521fc14 SHA-256: 0e2db6dba3a3bb70868c2a42039f88d87b52f056d9513763587f5a10d6974382
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting, likely serving as a distribution point for phishing or malware. The document body is heavily obfuscated and unreadable, suggesting it's not intended for user interaction but rather to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://oniceh.ru/uplcv?utm_term=what+is+a+liter+in+cups PDF link annotation
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d91e7b240ce---58840621167.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/4b48c2f43ff37b8b1483e9378247a040/vupeg.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160e8130c1e618---47712488625.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd6e1d21c8---wifinasapulogas.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/20889980172.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/vaneguromusego.pdfIn PDF document text
    • http://www.diplomat2014.ru/ckfinder/userfiles/files/23009509723.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/18945093519.pdfIn PDF document text
    • https://msiutilities.net/documents/17542145518.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/gidisebojituramufepe.pdfIn PDF document text
    • https://makenie.com/upload/files/nodozenu.pdfIn PDF document text
    • http://ymmicro.com/files/files/filimisitawuv.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/zebavezu.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/titetiru.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/54592337185.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/96838686649.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/kasaja.pdfIn PDF document text
    • https://nationalshield-uae.com/userfiles/files/busuraguxefi.pdfIn PDF document text
    • http://okun.su/upload/file/nuvagozubeginigimot.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40aef0a466---nodosegudoxinifetarepi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16071ebf13c094---tudaxaluwamivurolasufiwo.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/zokoxexigubatujodagipu.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8528a6b90---vapifajokum.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_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 18464 bytes
SHA-256: fcf001aecccaf53bb46ac129cfeb7503bda367718a27b2a32ba6fc6dbd33ab53
font_01_sfnt_off000107ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12005 10444 bytes
SHA-256: 011c689adc76c1e2abb1d463cd9351c047a6aa1cb1a957911057d453646c5b59

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