Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08e9350b9514a48…

MALICIOUS

PDF

86.0 KB Created: 2021-09-05 09:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5f1a4afd846ef50d57173e800dd0a1c SHA-1: 6eb331aa4b852576d98988846ff02e16ab4f84b2 SHA-256: c08e9350b9514a48b2936f0dfb40e3239acc8eae1f9945d3a38658d9ae6481c6
124 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, characteristic of link farms used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a non-clustered link farm on disposable hosting, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2990

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=debate+structure+pdf PDF link annotation
    • http://uro-medical.pl/zdjecia/fotki/file/dusuru.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/48105318588.pdfIn PDF document text
    • http://www.bandungmesin.com/file/loneper.pdfIn PDF document text
    • https://narimasu-chintai.net/jcfiles/file/27531118213.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce07e35bef5---vurixuroxasufozoruxopoze.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096b9ff2527e---nitopixireritin.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/nirusivexiwawunawibati.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/4se3p5ld3pdobo9p2vpjc03j1h/44046296908.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2d25497a4e41ce0c181d2e93053426ea/vugasogugetexi.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/97729591814.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/rubawateselot.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855a6a80355---ramuxefoxerivajax.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/wutuvaguvupi.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/de34543e27bf761ebedae246df009cd9/vezedulanoduwax.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/fajodavimoxuganapo.pdfIn PDF document text
    • http://ciskmv.com/css/file/jenujukugivalu.pdfIn PDF document text
    • http://brcassociati.com/userfiles/files/73302380532.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/widovefapa.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1611f51e3573b6---minilegujaxudur.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/jemure.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/bivegulas.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/da88f3307dded281b88e10611fd0d366/54984908917.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/96981684809.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/nobigojud.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0684558dfef08816681c34e80acac6c6/saxanonoxalugufarenuga.pdfIn 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_off0000fe7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 10492 bytes
SHA-256: 901920e8b8245445c46f1c4172baacd7a14015e4d44476baa7624b9acdd8ac33
font_02_sfnt_off00012e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 17036 bytes
SHA-256: f4bcf2df3b5436df2fced9f2a0e99be46431f1f927c5bd3fe8aacb5e095206f9