Malicious PDF — malware analysis report

Static analysis result for SHA-256 3447cf84e8eb353e…

MALICIOUS

PDF

99.1 KB Created: 2021-09-03 23:59:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 767c3534b330821bc5ec0e56650476d5 SHA-1: d1b224baff52ee606ec434f69019f617065aa49b SHA-256: 3447cf84e8eb353e4558fe14a6e72de36ad09ab3ecc0a1422ffa15c5f1be7653
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious content hosted on these compromised sites. No scripts were extracted, but the presence of multiple external URIs suggests a phishing or redirection attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9700

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://gadd-asso.org/userfiles/file/81345798169.pdf In PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21aee21da---62646347337.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/80467946283.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/5a8b36442d581c3e58ba449a681006a1/60151095715.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/h08t30tfem3clsi18pdopktc0q/52612344978.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/u16j93jcretv6ak20hle9bolq2/xalikojikirarutalutoniju.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/202162971488494.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/9emc7s7ou9o04s9smf9pn7b6qt/pexuwefozefesubon.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/popufodukigako.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87d89c0f0---pewonosipovikisunovifov.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/98045747712.pdfIn PDF document text
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/27605893736.pdfIn PDF document text
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/c04646f5doqodogpp27fenhslv/85688056828.pdfIn PDF document text
    • http://xn----7sbakif2a3azdub.xn--p1ai/admin/ckfinder/userfiles/files/zewuxemutokedatoxo.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/31864475290.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/tutujedalowemolo.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16090949d26045---sibopep.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/0vfo5i1omubc5g064edjr1psd2/81520587068.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/307926b9189a302d7979b69a8553d09d/lufubewenurovetexejeki.pdfIn PDF document text
    • http://naturabliskociebie.pl/userfiles/file/64183280530.pdfIn PDF document text
    • https://beruanglucu.com/contents//files/kezizolibosimepuserug.pdfIn PDF document text
    • http://jkohut.pl/file/19736131905.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e50abfa68c6---25253459721.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/megusujifonewajopasodo.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/wepizukenisasobeziwivuk.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/395269fb04e5132fba1d4b9aaa5a0c61/gomijobafezepotuji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ts+panchayat+raj+act+telugu+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10162 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11979 10992 bytes
SHA-256: 9e7787289737e3f1d870f5409b65d64c74214bc79a3410b47d786787f9d20bf1
font_02_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 20136 bytes
SHA-256: fc979e9cb4aedebf8edd4ad596defb2b8f40b76150d4886bb32332291246df6c
font_03_sfnt_off000166ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166EC 16180 bytes
SHA-256: c0217721a1102ad1f8a8ff5461faadb02f26a3634bfe128d67f68b25b112ee8f

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