Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2d3c110f0c04090…

MALICIOUS

PDF

87.6 KB Created: 2021-09-04 20:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23ea3552220df5fc89c67e4bc6b0edec SHA-1: b563630e506cdb216341715e5855e2a806a6375a SHA-256: f2d3c110f0c04090054199155323a758bdd1fbd2903379e971d4a5ecf6ea5303
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous PDFs hosted on compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the structure and URL patterns are consistent with attempts to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://constantemail.com/userfiles/file/1626360571regurufepala.pdf In PDF document text
    • http://ozcetinler.com/userfiles/file/kuzebukivagobuj.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/leretonu.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/26886124019.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/53061735983.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d6281b30be9---vetisinasanek.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e7d45bef7c4---68875129442.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/soguzujavakusalugaj.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/a79a2444cf9238464e25c169296219dd/65518807404.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/rg6hsmh7s6pa940i9q4sb13nvo/84134524732.pdfIn PDF document text
    • https://zold-kommando.hu/files/76571792518.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/892d75990013af58bdd42b13b5e63ba2/41204474712.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a058aa3fe---27626591911.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/3289392763.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/vulanunoxagage.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ee586a350---bibumexerugerikewewedag.pdfIn PDF document text
    • http://dzwigipoznan.pl/userfiles/file/gizumulivesidujudo.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/7f59a431e4f8ee280404dba9e56dfb5a/jomilokipeterexuwove.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/75286613683.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/sapiwijukekedowumidakodek.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/36028392213.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf5ea6006e0---bupezi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b047228420---netogefefuvibufakutejo.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107a34bd21f2---bexaxejibotojufanolo.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/katogipilo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161116ad482eac---53136912608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=quran+translation+in+malayalam+pdf+free+downloadPDF 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_off0000e91f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91F 11016 bytes
SHA-256: 1ba960800c6fe37218a4ebdef793143f8712cc261cd0d8c65f4d2c4d44d3e98b
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 20284 bytes
SHA-256: bf8be0f716c01f7a97811199b7a4bfcf74605b46021bcb99f4f0891d9a94b6fb
font_02_sfnt_off00013839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13839 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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