Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ce61dd7a5d8f3f5…

MALICIOUS

PDF

89.7 KB Created: 2021-06-28 19:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a93aeb134aa87b0620e6493a73425f5 SHA-1: 1cabf0addb601c98965ad78ff17dde3add3abde0 SHA-256: 7ce61dd7a5d8f3f586a39a928223da6b7aefd533170817d4675c9f1dd15056c8
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and embedded URLs are sufficient to infer a malicious link-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bad670dc47f---3204193116.pdf
    • http://acecaalcoy.com/userfiles/file/raxur.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/jguint111al7logm85pjjori9p/mujisoratoramunex.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf580aabfa---banojanisadin.pdf
    • https://anfauglir.com/images/file/90737120435.pdf
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f76a69b5---5938381.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/be3e8c7b291a8c330c4a018796ab8458/pejuwibibut.pdf
    • http://stillwaterponies83.com/clients/74660/File/divokeriluruveja.pdf
    • http://dgjst.com/upfile/file/19344691813.pdf
    • http://ultraljud.nu/bild/files/99883353965.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e0094191d---23349313829.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f5c20d5bd---9060188432.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/4843f0e3ed8f8d363ed0dcc4e6ccf8fe/8707169479.pdf
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/ac188dfb34aab750c10cfa1a26121c29/87273986020.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/e3flgnmhthpcl61qg4t4862hk6/woxivanoguwipenajopatu.pdf
    • http://kleinschaden.expert/userfiles/file/90748787573.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097622c495a1---nuvopapudomonizepar.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a556e75bda4---77230474992.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc3b5b6069---rimumumadakozitigumilazol.pdf
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd596376ab---sibobiriw.pdf
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b54e925af4a---28103485277.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/21625669282.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/6e7c3d9795105280043b7e8890cd6e0a/xitemarebeposokoxinatatej.pdf
    • http://euro520.net/userfiles/file/1623106187323269347.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/43aa3972b84914688f58a9fcaf750909/buxinudigawisefebanof.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b71762c94---dofexinab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=the+white+queen+margaret
    • 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_off0000fbd8.bin
de3af5cc735d0bc23528f7d39b1b752a8ef01a10e3a67904910f4814fc537513
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD8 18072 bytes
font_01_sfnt_off00012a3c.bin
42085e870ec5a340d3e855f62a154838c895c3c46ad88ffdc929a2d63c1fef29
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3C 10516 bytes
font_02_sfnt_off000141b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x141B4 16792 bytes