Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3de35551b6bc64…

MALICIOUS

PDF

70.3 KB Created: 2021-10-04 08:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0082d29cb6d0a92985efead6c80abf1a SHA-1: daec3fee66bae77c06fa918e964c2d2aabbc2c1e SHA-256: 6b3de35551b6bc645e9349c72ddf23869ed527829d907ecf21cbd6004091cfec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ketchas.ru/uplcv?utm_term=what+weather+zone+is+ohio PDF link annotation
    • http://12shio5.com/contents/files/7100111054.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/15372477044.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1615749c559310---nonokufufomobizexodu.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/6261315629.pdfIn PDF document text
    • http://ccsl.asia/files/11497403618.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/lodamumimabewobalololu.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/20611174234.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/losegesutapufimegi.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/fesowarotolejosizozujazu.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/2652213621.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/movawile.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/78823437928.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/diluropisaxosi.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/64068402920.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///negenowifilujeta.pdfIn PDF document text
    • http://stellar-toys.com/ckfinder/userfiles/files/98662923356.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/82605420858.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://balogmihaly.hu/UserFiles/file/82626558702.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16139aa4be96af---femogifopar.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615094a589cee---nezokor.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/29296786557.pdfIn PDF document text
    • http://china-shengbang.com/upload_fck/file/2021-9-23/20210923011741434820.pdfIn PDF document text
    • http://geojeoceanhotel.com/userfiles/file/20210902001334.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/84727575551.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/7205973711.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zediwe.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/63525297033.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_off0000b6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ced5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED5 14900 bytes
SHA-256: e0f73d38fb038f4bc1bd98870f3ba98fc2316308bbaa432fc5ea25cc36546363
font_02_sfnt_off0000f3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FA 10300 bytes
SHA-256: cf2821cf52b7bbf59b96221a7b334af5f48bea79284dae753d082dfc9fa770df