Malicious PDF — malware analysis report

Static analysis result for SHA-256 833b9043e16e9a75…

MALICIOUS

PDF

78.5 KB Created: 2021-08-30 10:08:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e208ad7133d6db9dca111bb85272f0b0 SHA-1: 5575c23b31d801d690458771e603e808e1785d0f SHA-256: 833b9043e16e9a7579ed00e0580fbc6b2742d11d05296f0839913717e1a1d666
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, while some are marked benign, are part of a larger pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ed2839c8930ec4c9eafae6bd072786de/jobememi.pdf In PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/witakujidomavinazukono.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b643cad911f---nevevefelujefumofola.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9897c0827---nomotad.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/deduvewera.pdfIn PDF document text
    • http://t-p-fortune.com/userfiles/file/90446411400.pdfIn PDF document text
    • http://zuche0551.com/upload/file/35016035121.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607536827c15c---kilopafaxetemiz.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f77b58660c---73020609054.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e5e94d1a4---36146449667.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/notexuvuwujasabilevojizul.pdfIn PDF document text
    • http://velocimapper.com//webfiles/file/tusik.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5715bd120---zivew.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/76765563176.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l1vps8klmhrfnjl73nbq783oa5/41999040350.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161048e72e8b7b---60693828187.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4durcn91m7pfqtgdbna4i21jc0/webazivakuwapigofedexanar.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/lizenofanuxanizomokisipew.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/61590731477.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///laribalokuvutivamap.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/0cccde43801e03aa9bcb15962d4bbca5/ketefopix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=watch+eternal+sunshine+of+the+spotless+mind+online+free+streamingPDF 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_off0000cbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF1 11160 bytes
SHA-256: abf32edb4e10e77abbc515c3527da09dfbc3473bef80f871b5c30a8d04690c5f
font_01_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 17768 bytes
SHA-256: 1ea22067e0a5dd2c7348276d4e94658ddfafc5f81b3cc81ae85f92fd7b361ee2

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