Malicious PDF — malware analysis report

Static analysis result for SHA-256 46c55b37d05d6ca1…

MALICIOUS

PDF

75.3 KB Created: 2021-09-19 14:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 62ad131abe8bf34657f025a1e1bb2f07 SHA-1: 1460c7f23528130f4c414a28563a105c6cfb7156 SHA-256: 46c55b37d05d6ca12fdced971171a25933bc883c30e2d4977e04af60360ff304
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://irlanc.ru/uplcv?utm_term=how+to+hotspot+from+android PDF link annotation
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/944fa6e78d3d77d9f6947f484fd96a24/31339030179.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/31754567582.pdfIn PDF document text
    • http://morethancars.nl/uploads/edytor/file/zozenogore.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613c90fd54334---82514249773.pdfIn PDF document text
    • http://terrietanaka.com/library/files/tibigutimevelunakari.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/64678330393.pdfIn PDF document text
    • https://labelmarket.eu/data/file/vegadaji.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/12945301654.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/29720185481.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4j6cfcvkmrrokc7u57elvog6v6/81513314048.pdfIn PDF document text
    • https://greenfuturevietnam.com/Upload/files/dabafoxog.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614693f1585f1---15916744028.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0ec1390707ade33d4a2b0cf14d1361c/dedanafuvebobajenon.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/bugemasolojoleji.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b80880965e---62833030982.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/40915062045.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/30204217442.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/gesadumojiwudefi.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/42197476877.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/1682451740.pdfIn PDF document text
    • http://esistore.be/userfiles/file/31471920306.pdfIn PDF document text
    • http://polins.org/public/userfiles/file/95426580009.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16138760465e2d---wobumiba.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/webumopisotezos.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/57781216729.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/29112625635.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_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dbc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC9 10664 bytes
SHA-256: ab2be2f9329d8782a8462ec2d46f07c630fb7d34e69f559f8d4d8d3a70f63bb3
font_02_sfnt_off0000f406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF406 16796 bytes
SHA-256: ba0e3ac77eec824a7e760a1865ab4dbf5ea5735c55f7449ba4c14de0cad29b8f

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