Malicious PDF — malware analysis report

Static analysis result for SHA-256 64a1ab06caecdac8…

MALICIOUS

PDF

70.9 KB Created: 2021-09-19 01:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e417d84a8015b99db9ae2a03dd40efb SHA-1: 72ca914f595c34e6613f33c23c139af9931b0ad4 SHA-256: 64a1ab06caecdac8dd0e6ef7603a7f5abb37b07891e9dfad95d4c9e6e95488ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=fifa+2020+android+offline+game+download PDF link annotation
    • http://studio-rivetti.it/userfiles/files/tinikenasi.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/wadigisutifumiligur.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109180718051673.pdfIn PDF document text
    • https://cancelaria.pl/galeria/file/lajakarumapumat.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/30756320236.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142745d314ef.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/97373168257.pdfIn PDF document text
    • http://hak-al.com/resimler/files/bigufubamala.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/97902620252.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300935032c4---gepidipesenuwukunuteseja.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/70483709453.pdfIn PDF document text
    • http://hodori247.com/uploads/files/wixidomiketizimubegira.pdfIn PDF document text
    • https://fengshan-zhennangong.org/upload/ckfinder/files/78155939898.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf3855d5f---7805702861.pdfIn PDF document text
    • http://cl-pub.com/files/files/46972168928.pdfIn PDF document text
    • https://duvanco.be/docs/files/kelipunenexusuxusunuketof.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/mobez.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/lavusetifafoperopujuludi.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/38807460871.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/61117666756.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/jebofekodove.pdfIn PDF document text
    • http://valeneighbors.com/userimages/94419164132.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/603c6a5a81f58a55be7d6b90c4cbdb49/darobi.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/78014496997.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_off0000b6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6EB 15064 bytes
SHA-256: 11b6502891cff49acf9c0720382857efd932dce8931de8a5e2c0e8da79491b1f
font_01_sfnt_off0000dcf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF509 10736 bytes
SHA-256: 61fc8a476bea79ad0d94659affed4c2d7c7a8eea9611c59caee80a0ae9929b15