Malicious PDF — malware analysis report

Static analysis result for SHA-256 57551ce715918100…

MALICIOUS

PDF

90.1 KB Created: 2021-06-27 06:02:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ebfe09ffa7e51568507819253e8a2a1e SHA-1: ba3e39fcd7b16093e3fc41cf77315c3f5c215d9b SHA-256: 57551ce71591810049eaf81a3b87c7528d4dc3122f1f7663c7dc8962ed774105
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised websites and potentially disposable hosting. The embedded URLs suggest a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=worry+about+everything+panic+about+nothing PDF link annotation
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e40b94fe85e35fca8b52b2a8fdbc0219/meminubeduxu.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/riluxazozasekubodar.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/vibopojukodituvosi.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/5cb04300422c56c2ec8ce9da963eadeb/63114854428.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/jejifikolasapatowawuza.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6396dd44612aa5b62c771851a83c240f/wawadanewuposuxunulobit.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609d455b52f17---fitowigafepazawurexobet.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/dixabawezabemesejajavixu.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/7111c23dafab69a6a67cad4608f923ff/47356148600.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c725facfda---fumabifumiwapuvatelikow.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/aa12221e60f83a90bd027b3b99181edd/68921255423.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc68784559---mabodefewenivuralokiga.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608133e65b85e---68809528149.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f5c4bc2b9---80302651908.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/gazekuvex.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/caee57d7e5b9b6d001dc37720a8f3cba/bovusulixotoga.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/59458561002.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/f9bvcr7k9u8dcob93dp59e3for/bujakuto.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rvsqacilod9a6mmljp2cpsfqvo/jivapozafumovusaleguwa.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/kc9vmpjd74kr5vbuuvlgh67142/pasinexozuketu.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/98364ca2554ecb57de599651072055c4/20936049420.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/c3b686e81e35ee0eab5e362310f1cb13/sujasuxojo.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/93414513094.pdfIn PDF document text
    • http://www.hmh.sk/files/articles/file/66445790653.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/7926923742.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 17304 bytes
SHA-256: e1c474917349d6e889956025c062868f20c442dde5cab395867189bec4289e28
font_01_sfnt_off000129ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000141c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C3 10852 bytes
SHA-256: 95306e19a43b9ed07d719bd8d032fe3b11674f0a498a9ed277a53dbbc787c4a5

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