Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d6c7af1888bfc49…

MALICIOUS

PDF

73.2 KB Created: 2021-09-06 12:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a00cbdba149827173ec0d5b4c7f7387 SHA-1: 71273ab6f913f7c58df673796e005f98183edc9a SHA-256: 2d6c7af1888bfc498b8abaafd9b1d32cb7d1da7e65fc4e6ba5590d93f7252331
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=patogenesis+impetigo+krustosa+pdf PDF link annotation
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/zuzedokasokiro.pdfIn PDF document text
    • http://phs60sand70sdecadesreunion.com/clients/880504/File/mepad.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/71659919832.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/xekirawus.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210621_E411D8C2ED284C97.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1612af1307---62391692021.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a522132a6---genuguniduvotewe.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/p6kvp4llians5lc43cbb0i1ere/dapofuxivenolagozilimeron.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608abb0121b28---53475530048.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/bododisawajo.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/38606535510.pdfIn PDF document text
    • https://aneri12.eu/res/file/jegetomewuzedew.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/35560276895.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/476679c21719df8ef1ec58057ba44b6d/nitivajoxadafelopimu.pdfIn PDF document text
    • https://cet.sk/res/file/tewiwegevudumevize.pdfIn PDF document text
    • http://zonwering-belgie.eu/ckfinder/userfiles/files/86491651133.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611d7947010c2---28025007456.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/9e23479b84322eb9ede38003ac2f125d/21044393197.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/44524379650.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/kotibanititowikilil.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/64884988359.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/wemozizagufovosula.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62b8e0636---wixivodan.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/9493d2379ec5213a93b3441301443f7b/7459818062.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_off0000bca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4B7 10988 bytes
SHA-256: 38bcefed392431dc10eecbe51cbc91420b38e10e546033e2f127c54780528319
font_02_sfnt_off0000ee13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE13 16156 bytes
SHA-256: 8190fae15fda99de5f588cc3aaf939f379fef75d43833ebb0216fedbf282961f

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