Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ed991f530cde6cb…

MALICIOUS

PDF

81.8 KB Created: 2021-09-20 22:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 949591b78ab9a6813bf7ce6cf4b34eaa SHA-1: 60cdfd927c83378cd7e33d3453de156894029b46 SHA-256: 6ed991f530cde6cba65050605bca612fc00aac133a4f67e4ef0fcbe07e4e1afa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The PDF structure and embedded URLs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://inwebjor.ru/uplcv?utm_term=the+encyclopedia+of+demons+and+demonology+rosemary+ellen+guiley+pdf PDF link annotation
    • http://osstemcardiotec.com/files/fckeditor/file/654203189613ff8e1eddba.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/jopevavixelexifavuli.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/56975229915.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614314b9df6f0---20552904339.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613b76c5f3a39---52366962408.pdfIn PDF document text
    • http://chiesamadremarsala.eu/userfiles/files/96488380768.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/57486186121.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/71421950729.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/lisojimirobabilak.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/sizokisife.pdfIn PDF document text
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/44471204352.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425f98a0cca---rakojisofubadok.pdfIn PDF document text
    • http://adriennemason.com/assets/files/zumosototowalu.pdfIn PDF document text
    • http://yeditepegumruk.com/userfiles/63051204807.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/midanutewuboxujomiwadeg.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2e06b8e4a---49835842699.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210917_AD46E07C87410BD1.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161320ce08f0b3---mofijazarelozobudulur.pdfIn PDF document text
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/88119339632.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/pajijakikojogosimoruz.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16144c5c5ea99e---vivigewememaduzebizebu.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/98445984651.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f214ff2ff4---kunodabibutupesej.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/kupek.pdfIn PDF document text
    • http://gibisch.biz/files/files/janemafemevopobipu.pdfIn PDF document text
    • https://mfdesign.hu/files/file/lofimawojulawozoj.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_off0000d7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE1 17944 bytes
SHA-256: 085e6e1ab3d94b07e1533d1be44c2130201ceef3e824771673edda5f451a04f8
font_02_sfnt_off00011eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAC 11148 bytes
SHA-256: 7850707f833285f80b3986f58ca6d3a64e2874ce3b51aa6a2b6f66f98cebca1b