Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af803649be8993d…

MALICIOUS

PDF

72.1 KB Created: 2021-09-21 05:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0c7c6b40e016329d7978ea83c85600df SHA-1: abc12963336f60c7405f0525cc7e10f90c3768bb SHA-256: 8af803649be8993d4202a0a8afb660cffa4c8f89bd4f1f2aede610629123f59f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9771

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 http://zekejozsef.eu/FCKfeltoltott/file/netevijajaradozivozinuwe.pdf In PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/75472627522.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/97512002462.pdfIn PDF document text
    • http://sin-hua.org/userfiles/73585716344.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/48317846188.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613029bdc3075---napazabobevikigadigewejil.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/tevepobomalew.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/25142001519.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/koleridutezetovibe.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l3mkfgonq17fpsukrlnpnkfbpd/85256644688.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/ruluwefejoragadizoxomewu.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/95894222098.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/votojofogitof.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210920_736CE1D2374017FE.pdfIn PDF document text
    • https://we-plus.tw/ckfinder/userfiles/files/gelumavupuvomemukaka.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/21066281716.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/bigokiz.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/xedegoma.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613efd21a9d30---gozinagozuga.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/160919411512.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/161492bc057b02---kawekilasawebixuw.pdfIn PDF document text
    • http://edallyshop.com/upload/files/19300830234.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/xokogimezafuwot.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/23249551457.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/15537238274.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/fivur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=hum+dil+de+chuke+sanam+full+movie+onlinePDF 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://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_off0000b974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB974 10792 bytes
SHA-256: b6050376917a810f3c2df344d504087a4e7f44a8cbb9fa6f2b6210fd92b6fc2a
font_01_sfnt_off0000d20e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD20E 16460 bytes
SHA-256: df63d2d6a2a82bedaf8ab88e7bcd92774b2d11b81e028895d1fd46db040f30e1
font_02_sfnt_off0000fc77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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