Malicious PDF — malware analysis report

Static analysis result for SHA-256 b656cda3168ef5e6…

MALICIOUS

PDF

83.3 KB Created: 2021-07-01 22:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 22af930799e2ecdcaecaf5a6e1e30b8c SHA-1: 05a956890a08b6763c66d0606bbaa58abef9dfff SHA-256: b656cda3168ef5e645542dcb3c32d3a832e69b99ff61a27073ef885af67bf952
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely to distribute phishing content or malware. The presence of external URI heuristics and the 'compromised CMS upload link farm' finding strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9664594c36---99931390667.pdf In PDF document text
    • https://shipnhanh247.vn/asset/files/wuzuzududelizefiweg.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6lskn63r32d743jlt6vtnrhb2b/savemozigomojiwila.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16092a1279962c---baribadawu.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/feradipox.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1e7f10dd5---wenetiwasubav.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/f7691cf7436dcd94b971884298fdf762/58940023986.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606efb722b030---fowogapivasuvado.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/6825626150.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/xakosesinikebitamob.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecc2e4bfda---mufasojisodotapijijas.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609847f8bda29---6300897825.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ccc2d7f6c---22206537702.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ded68457dd---xojopebixemibidivagax.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/25717851205.pdfIn PDF document text
    • https://afayl.com/userfiles/file/58566817965.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6cd210fdfa158324e24e68b16959fdab/vapejejajapewelogavet.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/lhkekvjhu7pa5snc2il2t0jk72/26189896389.pdfIn PDF document text
    • http://tafoto.de/img/upload/files/noferofufesaranosawoga.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/87108746206.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/pugebujikeladujigomaf.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/50427913612.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/f79a2393e9c9e21b2f158a9186edcb51/82547767532.pdfIn PDF document text
    • http://ty-universe.com/image/files/20210602_212156.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/21694484376.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16087ffed4d9db---71901797720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=grade+10+geography+exam+papers+and+memos+2019+pdfPDF link annotation
    • 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_off0000dbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E5 11424 bytes
SHA-256: 0a415e30528cef6b198580c2ce3ddda16a5f05d821ba09d4a89c5baa9f0f688d
font_02_sfnt_off00010e93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E93 17948 bytes
SHA-256: f92b0416bd7cff03cfb75c72dcabe3c2e92dbb490f4aeabbe329aba2b616b8e8

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