Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4d5d0544dfc265…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 02:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2defc8560934440721b0c74d887c8500 SHA-1: 1dfea62a18409c12bff1cf65c7ae9598eba2d0e0 SHA-256: ce4d5d0544dfc265295af9905f8188b7628a0e692cf4fb0cccba2cfb72bdd262
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the ML classification strongly suggest this PDF is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://laborke.ru/uplcv?utm_term=bhoomi+trivedi+indian+idol+5+finalist PDF link annotation
    • http://nexxosrealty.com/userfiles/files/suburuworaweg.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/44483063922.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-21/20210921050855907985.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/53139516482.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/gavamubolomelimevusegugis.pdfIn PDF document text
    • http://suchanekstomatolog.pl/files/file/pelebazezapude.pdfIn PDF document text
    • https://propertiproperty.com/Uploads/userfiles/files/kudupinijusasuj.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/4ivog5e5d9eofbp895dhrfl0b3/35968115655.pdfIn PDF document text
    • http://e-restauracion.com/app/webroot/files/uploads/files/36569765038.pdfIn PDF document text
    • http://novichiha.ru/pic/file/robuxuxudurowej.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/39199283464.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/37544525412.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3d6890124---vobigosefoxatep.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/xarolofafuva.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/ritut.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/11249859353.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/32905915131.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/vodesexegopotawuvusut.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/41305923085.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/97985270843.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/mugusoxerim.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/80030076433.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/nuvabitunebasakixopofoza.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/marufado.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/2f19enr5uhd534bjrefamag674/19852983581.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/72195055905.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_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 18684 bytes
SHA-256: c4eca6417f171f049c3a93e53a8f0fb15cb1e208713f50977aabdcb02138da75
font_01_sfnt_off0001108b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1108B 10872 bytes
SHA-256: 933b1ea5c890f4d88365ccb5374f3cf3f1e30f94cfb7964e2cf869f873a95d8e
font_02_sfnt_off0001298b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1298B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1