Malicious PDF — malware analysis report

Static analysis result for SHA-256 e48c3854a11f389a…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 10:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 53ab096586ff4cee9dbb3bb9e8a34c0c SHA-1: 3be060387bd06d3017f414bc62fa7ee86c96cdf3 SHA-256: e48c3854a11f389aabd27109e755f27bcc37ffc2470e216f4e3a789884f9fd12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or point to compromised CMS upload directories, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to directing users to malicious sites or downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=mandaue+postal+code PDF link annotation
    • http://avandcie-energy.fr/ckfinder/userfiles/files/42321664956.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/vezepafogazo.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/84450023806.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/f315fb3d465913c058b27628ec142542/70639677002.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143dd9d539b4---49434162877.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614404c2bceaf---fujudagafuluzuwuj.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/pubemijasepekokolobuza.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373917c4468---27980152927.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/47553563457.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/18742790756.pdfIn PDF document text
    • http://vejwun.cz/images/dinivibumiwivezitilo.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/jutuba.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/litojidewuwivetenuwimo.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210905_100458.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/tivezutufaguxufimuminikun.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/35575628682.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/vunezenip.pdfIn PDF document text
    • http://test-immo.com/file/33521352643.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/refizozifekonim.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/78546184997.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/pewej.pdfIn PDF document text
    • http://atdawnwelift.com/userfiles/file/11100943815.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/46493755380.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/95681054600.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/fapamivaxibi.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_off0000da7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7E 19660 bytes
SHA-256: d17829b6843f28e7365c8380c16d000caf355f02f7d26b5d6907956571cfc8b7
font_01_sfnt_off00010ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126B9 10408 bytes
SHA-256: 0fc7fbe95734d3829c21e95a69ce8c22db8416ead2de1d3bc55125b9888421b9

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