Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6eb77a4caf58419…

MALICIOUS

PDF

82.0 KB Created: 2021-09-09 16:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e1269794564808d2d0716e1ef3397868 SHA-1: 0f6495bcc453e357edc9ed66b86228bf56dc5135 SHA-256: f6eb77a4caf5841991422c9fad6305dc16b9cadd8cfa697cc704e79b3d62cebe
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. Heuristics indicate the PDF contains a link farm, with several URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve as lures to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://tybistanbul.org/resimler/files/46376054418.pdf
    • http://seidels-mineralienwelt.de/images/uploaded/file/dupufiv.pdf
    • https://ka-base.no/images_students/files/86845377831.pdf
    • http://azinsaghf.com/cache/fck_files/file/39673193796.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613190b5d2538---45892144252.pdf
    • http://keletunderground.hu/images/uploaded_pics/file/74638491735.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/b9d306028be4be9ed60c5e3656ba5222/2509248435.pdf
    • https://tktravelkorea.com/FileData/ckfinder/files/20210909_E8949F6D2DCEBA0A.pdf
    • https://idd.no/ckfinder/userfiles/files/gepevarexawivakelepav.pdf
    • http://www.globalnautique.nl/upload/files/87274865625.pdf
    • https://nasco-ye.com/uploads/file/26163290447.pdf
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/kofixajofof.pdf
    • http://evo-models.com/uploads/userfiles/files/15711420448.pdf
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/bovulikuwokuzadobonekag.pdf
    • http://stnicholasway.com/userfiles/file/kinaletolukilopiluzom.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/kemenuxafilenikadomawu.pdf
    • http://atdawnwelift.com/userfiles/file/91388166972.pdf
    • http://finchamauto.com/pics/ziguzusetiwagoka.pdf
    • http://perfect-aerosol.eu/userfiles/file/51699852046.pdf
    • http://artstudiodesign.it/userfiles/files/96748849064.pdf
    • http://spain-ex.com/images/blog/file/16538213954.pdf
    • http://tsraccountants.nl/mailing/images/photo/file/57718209190.pdf
    • http://www.enredmail.com/templates/files/idCliente_/file/fabaduwekopovuxi.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161358845e535b---dewasodorubaxuxaxi.pdf
    • https://pikhospital.com/ck_uploads/uploads/files/lolezofin.pdf
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/51785543741.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=idle+theme+park+tycoon+hack+ios
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d561.bin
8f02b4bf309a7206bda0d347d67ba33961c5b734ef719bf3da7150e497b33199
pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 19388 bytes
font_01_sfnt_off000108fa.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x108FA 16792 bytes
font_02_sfnt_off00012111.bin
055f0ccbb79ffa7b92ee0710d5a3411854dc12c93aa00f6ce67d5769d26a809d
pdf-font-stream PDF embedded font (sfnt) at offset 0x12111 10936 bytes