Malicious PDF — malware analysis report

Static analysis result for SHA-256 b772ee6b5ec7bd82…

MALICIOUS

PDF

71.0 KB Created: 2021-09-30 14:22:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ca03ab21e947a2ec1bbf3dc58ab634cd SHA-1: f7a4b02bc52d2738e19a15a4491aaa5296bc70a6 SHA-256: b772ee6b5ec7bd82bb6dedb5d45b1bb5be5980d165abcee9920d1c581251a487
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these links. No scripts were extracted, but the structure itself is designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://wastran.ru/uplcv?utm_term=can+someone+see+who+views+your+instagram PDF link annotation
    • http://tizianaiberti.it/userfiles/files/4677553625.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/60593592238.pdfIn PDF document text
    • http://www.css-jp.com/upfile/files/2021/09/13/zimugapajaraf.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161503b8882862---37181188677.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/xafamopimamazal.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/01f4ea01f15c8d4142575e81e2c07e0a/84096010141.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/39877752244.pdfIn PDF document text
    • https://hojoairport.com/images/file/12395882556.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4d67a7892---fiketotamuguwusakos.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/4544146647.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/muzuteses.pdfIn PDF document text
    • https://rosettes.it/userfiles/file/rogefuseg.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/bipupavodumekuguro.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021092507500476.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16141a985890b5---8120640910.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/f35b5e0901228f0fb3f21350e100da25/kuzoxelodirori.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/jarub.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/wularevodugosupotisa.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/47637516972.pdfIn PDF document text
    • https://www.lucaslobker.com/minor/ckfinder/userfiles/files/80010169989.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/46019197371.pdfIn PDF document text
    • http://liluby.com/upload/file/punewanonegipukodet.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/66057754498.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6fdc76ede90c193546f4efefcdfdf268/pufagu.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139453f98ef9---jetoxopisoreges.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_off0000b337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB337 16432 bytes
SHA-256: db8f3e34c596f9ec07b94455d2c57ea9009794c30967bb089b4550f5f30f14b6
font_01_sfnt_off0000dd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD45 10908 bytes
SHA-256: dbfd5e65e95cc03b608bb9c07652293fa491d8b4ebf7b5e964fd89ee2cecee1f
font_02_sfnt_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1