Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55f61828479319a…

MALICIOUS

PDF

77.6 KB Created: 2021-08-11 07:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a28c46549cb8b4cdb3a4f2e7703ac303 SHA-1: b1c956afa8abfc2c7fb5aa2cbbe41ea4f2051b91 SHA-256: a55f61828479319af7ffb894bea3ab9956c27bb75bdd853c57b7efc57d3c9d00
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating it likely exploits vulnerabilities or serves as a phishing lure. The document functions as a link farm, directing users to numerous external URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute further malware or engage in SEO manipulation. The presence of a 'Password-protected archive handoff' heuristic suggests the PDF may be intended to trick users into downloading an encrypted archive, which would require a password provided separately, likely to bypass initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://hotel-la-licorne.fr/userfiles/file/nosutefenimowolax.pdf In PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a674a6341---49805943265.pdfIn PDF document text
    • http://rapet.hu/files/78429057916.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/34c2b3733e4231b3e6a0fc43058e258b/32000336865.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6777417e1---56113590805.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/xabatukupog.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b64eff88a7e---nibunet.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c566ac84b---pupikanagu.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/2e46cd0e19c0fa42cc6cdeb057dd6955/jasinudutofeba.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/e8cba562537cf49a5a233cdceb64abe0/62807397450.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/zaduwatugalez.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751462d4679---89956730980.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/9f5cc8bcd41aee1d80396ff47b24999f/36990836786.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098cb1ba9b76---xiwurivi.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608010dc0d69b---tinukifusim.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/31192666176.pdfIn PDF document text
    • http://vinhthuan.asia/upload/files/35038326769.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/02c93d40b10c67892b58d0dc1c645f60/datogekefileji.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/lejizunagibamisub.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1a4d76d7---xovote.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/kenimamid.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/18990749008.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/lirosaridupixeraje.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/004aa42e3a26f19a5964357dc4d99470/gazugunegipofi.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094082258ea1---wigate.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0i2qrscleoeq5kc1tc7nh6a6tv/72528659228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=anatomia+y+fisiologia+del+cuerpo+humano+tresguerres+pdfPDF 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_off0000c5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EC 11260 bytes
SHA-256: 1d2b8bc6f855cf3ba2c0900474bf40a8c1329b8cabb8151ab3c0d621e5ace935
font_01_sfnt_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 18016 bytes
SHA-256: 1624611a7014b377c371a9fb2432644339e1c58254efb55ee3f3224eee2096d6

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