Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f7f41fa92abcbe…

MALICIOUS

PDF

172.0 KB Created: 2021-06-27 05:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 0fdbcf865c64fa24cbb74afcef8fd157 SHA-1: 1271515390458da53b95c0d09afecae847359446 SHA-256: d7f7f41fa92abcbe5d7d6683fcbcca4a293050201fca0306e7bd0edea12dd099
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures and the use of embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9727

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://zanhotel.ro/beficientconsultingFiles/file/54250916045.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160abab92bda99---visinuvemirawugudugun.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c68a73992b0---35562972585.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/forazigat.pdfIn PDF document text
    • http://guowangcable.com/d/files/44945105849.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/gawixekolexumetulopaso.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/d0f992f338611e6f7e6163ae5f560f05/zesamigevezukijaxabukado.pdfIn PDF document text
    • http://fitviewer.biz/files/file/tesakarifetiginevopusopa.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/56638646298.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16087e78f0ad72---60177627192.pdfIn PDF document text
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/jemexapijenolodu.pdfIn PDF document text
    • https://whitesal.com/data/images/file/6549_20210525041342.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sulikekigekerosaj.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/d88806930bd3a369eb3bfd89dd162ae5/46764239499.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/3c6647ff0565cad35f7d8be052fe2db5/zidug.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/da98a5b9baff8e428704987204b02e20/60072462210.pdfIn PDF document text
    • http://nemdanangpho.com/uploads/2021-06-19/images/files/nakidobexefug.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf6b179b1f---vudesadumojozitegelim.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/85539348945.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbed100158---semabonotekajapakanibeg.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a9e941622---2668819119.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/bd7580e5f3d7ad6304d83103fd458050/93405243673.pdfIn PDF document text
    • http://mid-europe-ex.com/mudepadukabedaliviru.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/948543581d225e6c4d7388e588587f47/tuzesuzemumipufor.pdfIn PDF document text
    • http://wych123.com/upload/files/xaposar.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9ebf106b9b4f9c70982a23cf63ffebb2/tabesor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=different+types+of+mediumshipPDF 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_off00023f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23F20 19812 bytes
SHA-256: fb99872cafa09e7a8ae4afd56144646b4f50a3befcc8cc2804677dc65e048379
font_01_sfnt_off000271a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x271A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000289c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x289C0 10768 bytes
SHA-256: 7c3501b087050c21e5ade8c4ff001effce53675e81c35728696af6f1d386e189

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