Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dc1a8474fe2768d…

MALICIOUS

PDF

88.1 KB Created: 2021-07-29 13:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3cdc9aa6e9bcd3863f90bb30b49df56b SHA-1: d9a30ad9090d55a205ada889cf66c6eab519dbd8 SHA-256: 9dc1a8474fe2768d7b30832e0369af54562b6b6bbc739aac73989795c89548fb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs, many of which point to compromised WordPress sites utilizing formcraft or similar plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://huntic.ru/uplcv?utm_term=la+importancia+de+llamarse+ernesto+pelicula+completa+en+espa%C3%B1ol+latino PDF link annotation
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160981a342cbae---gogeluzupuvilinivo.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/40050217610.pdfIn PDF document text
    • https://petek.biz/resimler/files/temox.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/mibupubofibidoju.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7f0bf1e62---5174495873.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607495c2a0d40---kisaxebed.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/c6efd60a58de06ef49d28952377ebba6/xexajuwunabupexoboxe.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/74934598908.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/6slsojokf9jh37e0p241knnmp5/pamawomujone.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608b68a4a0417---84355049730.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/wilelesutogikimizetob.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/48358556695.pdfIn PDF document text
    • http://hidra.it/ckfinder/userfiles/files/77488645425.pdfIn PDF document text
    • http://technocom.pl/editor/file/18665515701.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/bulimonera.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/91362508640.pdfIn PDF document text
    • http://cohensevents.com/clients/74638/File/44576704527.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c65cd273cc7---32541089541.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2e93a3edc---81600108233.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086596c23314---kuxezeb.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/likirugenenelilezajuk.pdfIn PDF document text
    • http://aweibel.com/Photo/file/pomoromubojolodi.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_off0000f041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF041 17772 bytes
SHA-256: 710a62d5d644c310a8880053528d1e3076eab639c5b286bf43b18c7cb508b0b9
font_01_sfnt_off00011d43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D43 10940 bytes
SHA-256: 561c792c9b7c991d6691185c99e6c98af1883b97a161fcc01f6d50dd87b86c4d
font_02_sfnt_off00013658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13658 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1