Malicious PDF — malware analysis report

Static analysis result for SHA-256 411a5bebc11f6314…

MALICIOUS

PDF

72.7 KB Created: 2021-06-28 20:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 82caafc91514b02afb65cad2faa70c44 SHA-1: d010ef968b1a828768a05d8d0d2299e5519163b1 SHA-256: 411a5bebc11f63144f5078da121a434b92dec0870971efb3b6410dd9fb4a0c5f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common technique for distributing malicious content or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous URLs, many hosted on what appear to be disposable or compromised domains, reinforces the assessment of a link farm designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825c71acc03---74697329818.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/44347e7b582d2b106aeef447c003315c/munexodibepurewaxopobodex.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/02fk60gqc6evck53v307evdc3k/71192003633.pdf
    • http://dzbnf.com/upload/file///loroxew.pdf
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/aqeubrnoko9bi6bf3h0jkbf9m2/28897377766.pdf
    • http://atenngo.com/admin/sites/site/documents/43478504250.pdf
    • http://hi-techfiber.com/userfiles/file/69988306592.pdf
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210618145258.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d8c0e32df4e---75191439030.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607281730de0f---pudosupi.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/09m5relb32m112psup37f1a3b4/78122681894.pdf
    • http://anatolianlgs.com/userfiles/file/falazesimaximogo.pdf
    • https://karapinarinsaat.net/userfiles/upload/file/migalipad.pdf
    • http://ahxxzx.com/userfiles/202105/file/82157074749.pdf
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/1c8a578d673ada1901a27aa785f88f26/jufuzisaguzuwem.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/e9c91b7896bcd290325e87356c9c9bf4/jomakol.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a725263d22---91730381886.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a29eef69---1258476193.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bcaa09d5b64---nuferixegojiweniluzuberu.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/rajuwil.pdf
    • https://audit-advisers.com/userfiles/file/meboterusapiwa.pdf
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9c2bb7d7---vudugijupesasedoxiraporo.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/98059313ef7bb3594694b7730e0080d3/rafireb.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=chlamydia+and+cervical+cancer
    • 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_off0000be82.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE82 16792 bytes
font_01_sfnt_off0000d694.bin
a9ce16864d42eeec2247e017940fddff97f12ff5c1b7e3d770531dfce208022d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD694 15584 bytes
font_02_sfnt_off0000fe52.bin
a7b5adde70e1c97e204025f828b7a92b1bc1b85c90167e844c914e68aef3c8d6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE52 10460 bytes