Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff55cc4dc1926a5c…

MALICIOUS

PDF

74.3 KB Created: 2021-10-03 03:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fb5cfb492d835b1260ad237a9d5dc0d4 SHA-1: b2177d9ada37f476c5f6fcb5c8a29eabc8f4a872 SHA-256: ff55cc4dc1926a5cc581e4168b543ff14680260d2fff84d21a2ba74f5cff4938
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://drafthe.ru/uplcv?utm_term=fundamentals+of+research+methodology+for+healthcare+professionals+pdf+download PDF link annotation
    • https://bokaichenyu.com/upload/files/fenurusesitifuluxagomibij.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/75285385963.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16154020a380c4---36720821042.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/jafoberuxetoxulowixoke.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f051637f76.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/rikowijerefakalo.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/simawum.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/lefidaxodaxip.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/12139183654.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/sajirigalog.pdfIn PDF document text
    • https://buffinvestment.com/upload/ckfinder/files/77589566535.pdfIn PDF document text
    • https://www.hosotte.com/ckfinder/userfiles/files/35185570038.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/somapikejikelabola.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/7063348135.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614904d472945---fixegopitonezug.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/fibixusasinuwipaxegani.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/zubiralexixinexek.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/lefumaviwivezibef.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/58058326063.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/37552131467.pdfIn PDF document text
    • http://luligang.com/ckfinder/userfiles/files/waniwizikifuxeninotor.pdfIn PDF document text
    • http://unseretochter.ch/images/file/81635901265.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/70846348160.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/bikanivisavoleru.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/13658866074.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/piwefekexu.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_off0000bc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4C 11344 bytes
SHA-256: fca911f528cba4c67732ff7470ce1aa267f649fc3d357fd1417dbe2ddc530b2d
font_01_sfnt_off0000d6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 17136 bytes
SHA-256: bea48c7e7d4793968bfb9f747f967dc9485ca4409564ade604ef319f7a62dad0
font_02_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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