Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c6889fea0a314e2…

MALICIOUS

PDF

86.3 KB Created: 2021-06-28 10:07:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 328063557ed632e74b75735d762d7a53 SHA-1: d9e470b542786b9bde0ffb77e40dcb27a51adf85 SHA-256: 0c6889fea0a314e211fe7366bf0beab951f3ddb55bb0321a7d17865ab69d3d17
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the URL farm suggests it is intended to lure users to malicious sites, potentially for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=ability+to+work PDF link annotation
    • http://codemessaging.net/ckfinder/userfiles/files/kijaze.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801fc8020b2---ruzujepipenasidofuf.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab49539676---9670392267.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/56988022428.pdfIn PDF document text
    • http://advicetao.eu/pictures/file/wajokubezug.pdfIn PDF document text
    • http://halaljones.com/uploads/files/45154171599.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/917bbe1898db0eb9fb1c617158a06366/24070345468.pdfIn PDF document text
    • http://aclamerica.com/customers/CMS-IMAGES/file/surir.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160d5d0d0486f0---sowurojofezesofuderevife.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/r9oas913ho5esgg9fcm6le1m4p/depozomir.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a30020b8c---zakoxis.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f3f46a3b0fb3fd75cd3dc3470c789939/pokitexelogeritawame.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec9b695ac---93182137614.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/belulutusujenepoxor.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/2d0b3d59d9cb0109d61578ca48d553cc/nipofafodomowimoxofuson.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/33531967957.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ear7tlht70ec9mf0g59pak3nt6/xuwalinuvamiwufug.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/25131d40456a72cacff6835b5e16d088/74064020506.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082e1a801405---xazezupodedafixomef.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/62320354576.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/3c2b9c6c2d1d9635a074fb3856add18b/86500884815.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072bd8d00101---66378425835.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/rejudebobonizaped.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098f33c78bce---pagajadepamegobo.pdfIn PDF document text
    • 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_off0000f1a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A8 16996 bytes
SHA-256: e9aee43fdce63daf79a980145c311e561187c76e4fec2bdd806504bf66e9fdf4
font_01_sfnt_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135FC 9948 bytes
SHA-256: d6697cb65ffcd4857ba33a434d920d4b18c71ae9db60193e40b345c8ccbad3df