Malicious PDF — malware analysis report

Static analysis result for SHA-256 06b3413ec57b35f9…

MALICIOUS

PDF

97.3 KB Created: 2021-06-28 13:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a89f53d8de89e662c8757a48f9e0b63d SHA-1: 2bae5be9f589fc9b8cbed09da9e7534ef3b0a0d7 SHA-256: 06b3413ec57b35f97c925b69954cd9a94c2fde5f4e5d7f5cff5fb9fcf8eba956
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the 'formcraft' plugin for file uploads. This suggests a link farm designed to obscure the ultimate destination, likely a phishing or malware distribution site. The ClamAV detection and ML classifier further support its malicious nature, indicating a phishing or trojan payload.

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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8afc762f3---55800254158.pdf
    • https://stbenedikt.ch/userfiles/files/kipuwova.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607192df39db3---28349975813.pdf
    • http://visit-pune.com/userfiles/file/59947395547.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1db59b158a---nosafajumegawewefo.pdf
    • https://quangcaowebsite.vn/uploads/files/befafuwobikavadipevexo.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608e23f7b3a05---kifofepasinutez.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c88553fdfe97c735c712a6eb6898a34d/2917954557.pdf
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aef81b161bd---48718487538.pdf
    • https://daaeportrett.no/upload/file/mupuwerexowusigutodadesad.pdf
    • http://originalcheck.it/public/img_admin/file///99553994155.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b81e95106fd---25625374068.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/f4029c2c159ec17bec448ae61ec6f0a7/42317377991.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087533739829---vapivixejenegagem.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/gaktvau17ja1kv01eo2m990kj5/kofaxevel.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711bb8c3db4---73027720014.pdf
    • http://smn68.com/clients/75339/File/4107745591.pdf
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/cca6ac3a757cca8ff005921e7d88767e/62160717143.pdf
    • http://northcity.rs/slike/files/37372655476.pdf
    • https://ukmalayalamnews.com/userfiles/file/tabewe.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8d46aedb00---pugapinigox.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebc4267733---vofagowovujipowi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=lease+agricultural+land
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/891c76a13d259433d6b242a49aea8a42/lobunuzeregugivew.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_off00011c8d.bin
eae5c0feca5fb9005e8161a373ceeeaded0f4cad28486cb9d3fceb3e06fa3566
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 16944 bytes
font_01_sfnt_off00014869.bin
240d85beb0f312fcede14ae13b5c663aa174fe696df707470dd889c3c9e721e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14869 10480 bytes
font_02_sfnt_off0001601b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1601B 16792 bytes