Malicious PDF — malware analysis report

Static analysis result for SHA-256 55bd598ea5aefc0e…

MALICIOUS

PDF

86.0 KB Created: 2021-07-03 14:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7fbcf926ee6f9ea65af2cdbb2ce83372 SHA-1: 091f1997d7bbef639b9ce661c358a0726d65c7e9 SHA-256: 55bd598ea5aefc0ecffc87fb2bad8557c0cf84d26c0274994153710e1c21e652
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document functions as a link farm, directing users to numerous external websites hosted on compromised CMS uploads and disposable domains. The primary attack pattern involves luring users to these sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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 http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070df0d66dd6---gavaperunexuto.pdf In PDF document text
    • http://ladyvenus.it/userfiles/files/78657223477.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/78878095855.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/f3esj4fu14m946dr5lgrd7r2sb/jisugarilizom.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077f60a6d99d---42788837476.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b853dfebd50---xogalolisuxolo.pdfIn PDF document text
    • http://kennedy-jackson.com/clients/f/f7/f78508644b517540cdb1549d93860f53/File/77527871606.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/zosefujazewaverifabelavu.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/noxebilawalexu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af90cf1cf0---duvepabuzidifogidet.pdfIn PDF document text
    • http://peak-experience-japan.com/92745514216.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b30d4cd1171396feaad7a2e9d013ddc5/68559689398.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/zidanomiwuwikuterav.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/99143798505.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/xaxiperafilakufa.pdfIn PDF document text
    • http://cbwmd.com/uploads/Files/duvavuxutedipusagefusuvor.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16242606916622.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/wadutepuvameweg.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16079ad8c76375---17457954948.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/eb3094749b130858587e5bbcbaacf1d4/37987150386.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fbebc34ea554489248b3b8a23155761c/45045285464.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/946ec513668fd855f29dd6d4eb016b7d/vovobumamusikiz.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/acm3mtenjunnt76uvhda6t888i/87568237698.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/28aec8fbad0c7cccdb8891abf03cbc3e/41217222630.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/43775164121.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4074776985.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=all+asia+asset+capital+share+pricePDF 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_off0000eba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 10228 bytes
SHA-256: 674062117e5a94c9a86a64797b6192a3cb8a1ca828733d6374300721d3eeefb6
font_02_sfnt_off00011ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD3 18348 bytes
SHA-256: b085573f098b874a576d742c1c6473f5602e44ec227ffdb542656efc9890f887

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