Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4968866c53da5f…

MALICIOUS

PDF

79.8 KB Created: 2021-09-11 07:04:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eabb6527be233f789cc6df0b835a6de4 SHA-1: 2e76177fe254826895f656706bd1059a07a6a212 SHA-256: ac4968866c53da5f2338afa07dddfd5a49950653460a9d2b4f704cdff62f9e58
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of external URI heuristics further supports the attack pattern of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=dr+fone+software+for+pc+full+version+free+download PDF link annotation
    • https://hilanguage-com-tw.triangle-design.com/files/regazelisudibur.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/wakupilonuj.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/kazabezurokekojadupifawas.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/72281060715.pdfIn PDF document text
    • http://fatimaartwork.com/userfiles/file/mofipulopuda.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d78953766eed8dba67a7cdb64f93cfc1/57987585532.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/gonunovijapokajoranufuneb.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/33256974412.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/velojufal.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/fisarumilituloxoluwuvazin.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/sejik.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137aeb17a723---mulaledunadaf.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/95976403170.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/gedalimazomufafokudo.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/48125952922.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/zatuw.pdfIn PDF document text
    • https://spacio.hk/attachment/file/sevitexubemaguvezojif.pdfIn PDF document text
    • http://fishingas.com/userfiles/file/wemopemajos.pdfIn PDF document text
    • http://shinyoungvalve.com/userData/board/file/gezibugusuwenoxuvak.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/ruloxovorivikofu.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/mosokesuzevenunar.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613940b9677b3---78201521400.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/famesefok.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/12143632604.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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 17188 bytes
SHA-256: 64e399c940e633e5812d84588e79306a5b6ef9eb1325182f75a2098b9de5dee4
font_01_sfnt_off0000ffce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCE 10864 bytes
SHA-256: ecb77e1ed7fb7ebb95479ad647d26db651a3b4250065f54bb8ffe9163caf9209
font_02_sfnt_off00011919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1