Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec926b2552ba2ed5…

MALICIOUS

PDF

91.1 KB Created: 2021-08-01 09:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8a20ad954ef246eb29a9f0276f1b8107 SHA-1: 658961b8324b27e88d506c9b26d0a160edb3472b SHA-256: ec926b2552ba2ed5dd5a9df0a004c14bf7e8a0cf17d8ccab64456aa5e6666ecb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a59ce373345---pabejisekiwakulusu.pdf In PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16095a0cbc28ed---naginorenewolevopom.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/gupetifewepe.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac7d750c7b---44228592973.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/e439d2d52a10327518cf0587e02cda77/fedeveposubozexewixepoj.pdfIn PDF document text
    • http://tj-1970-50yr.com/clients/e/e8/e8fccb6fb94f20b6ca4375945b3939e1/File/kofeseligirapubejon.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/24274534268.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/32470087945.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/zapinawipuxopuzemifove.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/75922486034.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/70770637578.pdfIn PDF document text
    • https://krzczonowice.pl/gfx/file/janipupisatadanumip.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/57365462298.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/zolefoloxeguzam.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/01069d03bb30dc4eaf4aecdaa4f0799a/59468098632.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/4917249210.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/66f8916dbae093808621b9007350aa8f/84336943006.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be87f223cb0---20844941122.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/14627501820.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/pekuwejurer.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714fc656aa4---bigilotuk.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/b20cff9e3bad456b816aaf501dfe8420/femofesuxaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=thiruttuvcd+tamil+movie+free+download+2019PDF 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_off0000ff2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001173f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173F 17032 bytes
SHA-256: b5bce1548bcc180fc9b6f4da1c69ccfaae350d34d2e34c97f59b9b5399c80983
font_02_sfnt_off000143a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A8 11248 bytes
SHA-256: 98a1206f349c65e80b37423a8496b5fd70ff9e988f7f7554b8421871a7a569a8