Malicious PDF — malware analysis report

Static analysis result for SHA-256 0899f5d5d7973c21…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 00:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7767043945edd6bda7142d3456b8aea SHA-1: e144853f169893bba8c5c01c001ad725fe7520f1 SHA-256: 0899f5d5d7973c2139fa8020f8ec1c81712c535f516c123fe4c140187826835f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The file's structure and the nature of the URLs suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://laborke.ru/uplcv?utm_term=i+always+have+bad+breath
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/2af893a49fcb895f4b06307bc9605fcc/61162317237.pdf
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/be7rejmet52av3m8mbml3cha11/diver.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608076a78b7fe---17756361544.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/8bba6c7f3dd54dc40b622778f3a447a3/volivebuwarezexerefebo.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/5382p2lqgngm7633cgbk9rlu30/17536262354.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb3725b920---sedaxizosonoronenalab.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1607d709a9bcb0---31410795154.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a23a9cf62---sajazazilik.pdf
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/nm3a78uj9l0alp94es83nh0kee/kopogaraxax.pdf
    • http://adaviestransportltd.com/userfiles/file/65660052554.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fe868f54c---muxogivijomurov.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/srrc7bsg49n70m6ure95g2kq1q/delono.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822a12de4f---nijelategiwowu.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608726da54585---91321212237.pdf
    • http://the-bom.kr/upfile/files/nozakofuridojigovedor.pdf
    • http://maxbrio.kr/files/files/netaxexexovikavagewumolu.pdf
    • http://consulcongress.it/uploads/assets/file/xipov.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/544b9e4fb988f36d38d55460e73832e1/57396820577.pdf
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607781683396c---gukizenaj.pdf
    • http://medob.org/SITE/files/editor/file/tazob.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/092689d01dadc4c1a7910d54338fdb2a/mibap.pdf
    • https://festival-bg.com/media/ckuploads/files/6601259226.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/371fa067417aac3f863c08aa9d3e6cd1/ravadoluvarosakufuwid.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/d25a5a63aec15fdd177c32bf149c3dc0/rexafa.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/651ba64f49b96e81d60a274c94de4d0a/91778845255.pdf
    • 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_off0000edfd.bin
ef5e3ca671a3cded1c1cd73488576c8bd82c0716e3d181446bdce4001d3e9cab
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 17568 bytes
font_01_sfnt_off00011b12.bin
91c61fbc55ce951972102c3a59a84ad31f23dfc1244861798ac4b71ccb0d56d7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B12 10384 bytes
font_02_sfnt_off000132cf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x132CF 16792 bytes