Malicious PDF — malware analysis report

Static analysis result for SHA-256 81314ef290480f4a…

MALICIOUS

PDF

88.2 KB Created: 2021-06-26 22:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ece86f053dc18cd3f9a264dde0ef588b SHA-1: 1a7e9d9273b916b25df60046ae13a21e75201a7b SHA-256: 81314ef290480f4a9146a539d4166edb4a2801a9609896340f5c006e0f3fb473
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be redirecting users to potentially malicious content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://brooklynsmokeshops.com/admin/images/file/refubifutisojefegi.pdf In PDF document text
    • https://aterhesseg.com/up_image/file/30016045843.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/44089545222.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/801d33568582848942b4666e8deaa94b/ruluk.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/1b74d135cfb4305e80d3fe9885066e44/zotapedubudekoturezujer.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/79562287410.pdfIn PDF document text
    • http://upperdublin1970.com/clients/3/3b/3b2fb281f4756d03d37a29c41a8c1d95/File/sujinenefesulaxupifu.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/b37983a491e526c6a72e52415d271c10/74104056019.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6238da5fb---fotaxowilabit.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/6d87abuq9nmaecbqsqko2njbsk/suvaxate.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tuxunepuruse.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7eaaaf2c8---dudidosukujinowaja.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160968cb14f125.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/74393484599.pdfIn PDF document text
    • http://cdwy028.com/uploadfile/file/20210531113010.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/284ace4f38045a84e95c94fa86880343/76356995843.pdfIn PDF document text
    • http://www.meditt.com/wp-content/plugins/super-forms/uploads/php/files/54vhstu8363o2m1ifcpi8t8i39/xefokitimiwemo.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/tesobefoguva.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9u38m37jkej98tgiv30933i8km/91637265424.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/a4792f2519e3b97f3ebba68f80a29e7f/lupegunexubodimovuxopu.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c24f827c23e---4958006035.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/ketemegiko.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/def6eb7ad8a66b57ec8b073e956294fd/bakiwirojolatefixunexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=dna+and+rna+are+what+type+of+macromoleculePDF 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_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 10924 bytes
SHA-256: 17b45e52f74c72a84abd0bb8f4ba042caceef3f587228a17e8d6dc3d6ea7f760
font_01_sfnt_off00010d85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12597 17688 bytes
SHA-256: be6a7c775fdc37067077ddedaa1569efba10feb6087036fef5a325855e1405e3