Malicious PDF — malware analysis report

Static analysis result for SHA-256 d86760a8ce1d261e…

MALICIOUS

PDF

87.2 KB Created: 2021-07-22 12:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c637e82ec696fb005162a276a76eaee7 SHA-1: 20754cc4b246b2f835b8ca4edacc4e5218d7e73a SHA-256: d86760a8ce1d261e8f2961b8dc14f15d87dafd4def9e63b777bf91e87713aac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16097dc395c4dc---7402251201.pdf
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e7eacda5a---jasusolubinelolajobovose.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/jugakavi.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608795507205a---roxegop.pdf
    • http://broomfield82.com/clients/4/48/489ff1710263d1ca947d92387d56c809/File/63762951704.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607908d539c55---jefemuxazovineridogapat.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/043beb19e4d391cdc2478d1378e1a4ab/nibojix.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1aee2bgou4umo514av6o82grd1/vovuvusaferigabovogep.pdf
    • http://owv-sad.de/userfiles/files/98577689834.pdf
    • http://aktifimmo.lu/userfiles/files/xubozat.pdf
    • http://giadinhlaurenso.org/upload/files/koxotoxos.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7c50b34b9---65867839804.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd5c09b97e---59268777030.pdf
    • http://iburgisidimarsala.eu/userfiles/files/titivijiluveparovoso.pdf
    • http://eurogeographyjournal.eu/admin/fckfiles/file/dunamumepoxesa.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607945666d235---66884462406.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/olh8u5427hc5fhfcf5366fkqiv/59369320631.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/6dc992f8ddcb278e96c34af3807b7b45/mijawirutozabimubitot.pdf
    • http://aftckwt.com/uploads/file/kutirepusabexuzomewa.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c58be4e4a---70554651570.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3f446190d---22782314035.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/8c815196ed9e75ed02c8bbf035106440/baxalafofodowopotunaru.pdf
    • http://podwierzba.eu/ckfinder/userfiles/files/68551779285.pdf
    • http://king-ber.com/UploadFiles/file/20210619151136161.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/1c2d4dbe5cea0f9a4ada7514349d23ea/48927815187.pdf
    • http://archimax.ch/dynamic-images/cms/file/97237937684.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=3rd+grade+fraction+word+problems+with+answers
    • 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_off0000ed68.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xED68 16792 bytes
font_01_sfnt_off0001057a.bin
875214d576cfca3df81624dd91c3ca6105e42bb4b352e6a1fd93c373a3d5f34f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 17556 bytes
font_02_sfnt_off000133bb.bin
bb321b13d45d75ab49968b8a2dabee9786d681c714c7a1d014480572da6fa640
pdf-font-stream PDF embedded font (sfnt) at offset 0x133BB 11368 bytes