Malicious PDF — malware analysis report

Static analysis result for SHA-256 9329464816f6458f…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 00:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dc8b28bb20d87e17b5b124f6a0032fd SHA-1: 29b4e0d1882a31292ded08e602fa25cba25e0b80 SHA-256: 9329464816f6458f6bcaa5809edae08668fdcd7e06484eef895f2a438cebc265
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It functions as a link farm, with numerous embedded URLs pointing to compromised or disposable hosting domains, likely intended to lure users to phishing or malware distribution sites. The presence of multiple PDF link farm indicators suggests a deliberate effort to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://zerling.eu/nico/images/files/nenaxadafizovuzujumed.pdf In PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609490a56e1f7---pedogoxizonik.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/gimadukutoxelidebopudo.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6a9147cee---49002828454.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/rapadukofaxonofigiger.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffad1f1391---rebeb.pdfIn PDF document text
    • http://www.toeterloeh44.de/files/18289163610.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a06ef3904---82417758693.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/wozoralerimozasina.pdfIn PDF document text
    • http://kasargod.net/uploads/file/josakolelepo.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/lenuwutejaniriwe.pdfIn PDF document text
    • http://schokozentrale.de/idata/zimisigezanuwegej.pdfIn PDF document text
    • http://aimic.com/userfiles/file/fagilapavutifixavo.pdfIn PDF document text
    • http://linker-apps.com/files/xatunifapinilodafa.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/nugusukefasaxami.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/9620ef8d3e3b94bee64c096742d4ffd3/rujulileboxozojanege.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc801f6946e---wewabibigezunep.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/xoguxekinaxa.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/lixejunisiji.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a36b7766992---vemuze.pdfIn PDF document text
    • http://dzbnf.com/upload/file///87938379579.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/65609395567.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d19952be8---wetej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=bacteria+vs+virus+worksheet+answersPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cda4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 10676 bytes
SHA-256: 4c1c323aa2546c25113e61a09ba7e1a85a7cc385297dbfd209a00291a5ed472f
font_02_sfnt_off0000fe49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE49 17680 bytes
SHA-256: 4e466e65546e3225344bec851461b74239fe40f8f881684cbe3aa768d636a806

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