Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c71260cf60cf30…

MALICIOUS

PDF

84.7 KB Created: 2021-07-06 05:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f864935e00d34c74a197d6cbe6bc7674 SHA-1: 4d067552042de3a9d66b634a3e8768ebb8e8520a SHA-256: 65c71260cf60cf30c19d103a6f9607a30fbe92b719e0e0b6f1ea7bf581c66418
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://jaiminsales.com/ckfinder/userfiles/files/botuwezetogelugekezado.pdf
    • https://cafemocion.com/userfiles/file/lifuzodim.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b4b5201441c62a407d402402c9ea4be7/motapilagalurewopatezebe.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/cb224f61abdf496e68d4c9e709750f3d/tikuvoximino.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/19c9aec518a346b82c31f91fa218f5a4/libutejalavebuzubewimosuk.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb01b4c6ab---85826502088.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ae5fa0a40---52392796786.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607f606fd454c---41224125240.pdf
    • http://dringraldi.com/clients/7/73/73ccc230e5ee2b020474e4a43bcd07af/File/40673453646.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/50798339675.pdf
    • https://sharjahcements.com/images/bulk_images/files/30345465650.pdf
    • http://braciszewska-klimek.pl/fck_files/file/zibodudowisi.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607919e6a15f4---78350085337.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160949e136b940---44541025756.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/tivunedezajidonipifotibe.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/c541945281e8967266eff4549bff0451/suvunut.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/is436ehsr59sv3pdk0b99ojet6/67093119787.pdf
    • http://hrt-foto.hu/_user/file/norep.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ee20b0d2---bogebixaveba.pdf
    • https://perfecthospital.org/FCKeditor/file/48982301674.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16094c909a6218---19084943638.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8754d3c8c2---33324468057.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802e5b69015---menujiwote.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2a61ae7bd---gezowumogela.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=career+objective+for+resume+for+nurse
    • 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_off0000e8d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D2 16792 bytes
font_01_sfnt_off000100e9.bin
73487771aee31278a105194f4ca6f74d82167ef70859479cd3b2fc746f3faef6
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E9 10920 bytes
font_02_sfnt_off00011a39.bin
c693619b12ee911f547520f17358a5425e693c2c142b55e212609911c0eaea7d
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A39 16544 bytes