Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbd5ee24552bb8d2…

MALICIOUS

PDF

82.9 KB Created: 2021-07-12 16:27:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15b8807debcfc5a9005b8a4ea9134247 SHA-1: 55cd5b0d0954b8f4772a9eb20756e9374075dd8e SHA-256: dbd5ee24552bb8d28e427b462c1d95167360360a3eed3843ddddcf07c5589cff
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to external websites hosted on compromised WordPress installations or other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.maderas-navarro.com/ckfinder/userfiles/files/28493533371.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/16074d32d7ebcf---patuxitasokinupepi.pdf
    • https://kurtoglumob.com/upload/file/kedijotesezetamudomufis.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7322d27084509039a34ccfad0dde76d5/vidorekudolepuwuvugu.pdf
    • http://yuhenganquan.com/userfiles/file/20210604170321_686748892.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/0trdb48actk6g0qq8dioraq8as/89068441502.pdf
    • http://soldearenales.com/galeria/files/zadejunarisorumodap.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160926cb604e35---zasedumaroropeka.pdf
    • http://rockhousemethod.com/ckfinder/userfiles/files/17269749527.pdf
    • http://championshipsportsrings.com/clients/23492/File/71975766093.pdf
    • https://mk-sito.it/uploads/file/93828571842.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c7085a364af---nolafoxevajetofasekirera.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/bd24255ebc6bb8b61f58118b696daa62/95807202422.pdf
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608893d547421---71128375760.pdf
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/valupuvexixijifuj.pdf
    • http://szao-spb.ru/images/news/file/mixowonolebi.pdf
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae4c03e57c---pewidasidijivebig.pdf
    • http://omgmediatank.com/userfiles/files/52594807775.pdf
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d652b2cfd---1805718409.pdf
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/52ff74c21e48f776053850c45f72c7f4/47780807494.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/i9i56fuuejq1og8duhfav19veb/xaremexomip.pdf
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/1300c0e89fbdbe19e4ffa3bc3b6b9fa4/majuz.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608a06e801e5e---wusasajunijotuve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=life+of+pope+by+samuel+johnson+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_off0000e106.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE106 16792 bytes
font_01_sfnt_off0000f91d.bin
c3839600cb63bf5babded50c4315de1adf98e6f66e8a69904f06718308dda5ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xF91D 11004 bytes
font_02_sfnt_off00011232.bin
168d9353a7a86a5a5cd9f99e8eb1d102207efe34be17e7f07b0c624398202fef
pdf-font-stream PDF embedded font (sfnt) at offset 0x11232 17008 bytes