Malicious PDF — malware analysis report

Static analysis result for SHA-256 9847694cc4c0aa0d…

MALICIOUS

PDF

84.8 KB Created: 2021-09-03 10:01:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 40341ebe2aaa229c10c45bdde19998cf SHA-1: 156a4db3262083017b52ab448079efb6af4779bb SHA-256: 9847694cc4c0aa0d6235e1bfe5f7e0d1840a3f91c39b9f3eed30aa9b7fba4a11
176 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns suggest a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://jfe.hk/userfiles/bimig.pdf In PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c136320bb71---18059688469.pdfPDF link annotation
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/835dca2e474898b422a3d50d25cf0586/lojukusewafitaxuletik.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5afdbe58b---wobunogofanopumino.pdfIn PDF document text
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/duzumaxudutezos.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d4e3af18e92---renokamolabe.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/39026044879.pdfIn PDF document text
    • http://soupworld.de/upload/file/mirak.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/85966295462.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c451eca6ae6---zaresiredibimokino.pdfIn PDF document text
    • https://mihalex.by/files/files/panavodirifakape.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2aa4d7947e709ad62621035ff0edfaa4/22735782763.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/416f234a74e1c0bf726ce608ee2faf25/niwelozuv.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/fowopi.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/kukigatetoza.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/menufozofatimarejosizujo.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/48742865523.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/gd0llb1sam9fa6dfajfmnsqm2e/11992788152.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2c2bf4ac14---91466507865.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/19712887847.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160814e792b38f---sifasujenopubupimoj.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/23436463230.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cc57b0d80---tikatomogegumuvozekoko.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa8f9f0c8f---bepukijazuz.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/fodawapunoferodonujovu.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/pikotanega.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/44570395efaab27ab0d4e81a471f69f7/46963165512.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/sokejowibapidavitixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=water+systems+worksheetsPDF 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_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 10416 bytes
SHA-256: 3698d47b6e916a5a7876f2d95394d0b08b6d38156a923bc953e664a620f7a609
font_01_sfnt_off0001008c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008C 17220 bytes
SHA-256: 281100b03cda3294089cfcbc32a1cb48af7761ad760a85f6ae64206ef632b81a
font_02_sfnt_off00012d39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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