Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3833dc894aa9df…

MALICIOUS

PDF

81.2 KB Created: 2021-09-24 00:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1b9a1380449f64623ef7038baa88bd48 SHA-1: dd250212e39502cb1bc7c70f0acd452b89ff407d SHA-256: 8d3833dc894aa9dfd9739ffa2b7f706d3e5e8b28fcff15bd4bf162e2792d76cb
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. Heuristics indicate this is a link farm designed to redirect users, with one URL specifically mentioning 'hattori game download' and another pointing to a compromised WordPress upload. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cructi.ru/uplcv?utm_term=hattori+game+download PDF link annotation
    • https://cliniquemyo.com/userfiles/file/lonatuxomobuw.pdfIn PDF document text
    • https://bedandbreakfastholten.nl/userfiles/file/juzepagowabutikom.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/tikufutetisanabamewo.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/87594930319.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/4378391156.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/50207698097.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139995683f8b---bedilopibawop.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/xizamexoxaj.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/sumatanava.pdfIn PDF document text
    • http://dhf-china.com/d/files/51793983797.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/13376297657.pdfIn PDF document text
    • http://christopherdallo.com/file/gosotenegapar.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/0sbmuuktrmojpec3jj2m6u5hnh/bizateripalututexa.pdfIn PDF document text
    • http://ausafe.net/images/art/files/40776908098.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16149eca2e7bcb---joxuxaritaguvagifu.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/4777611967.pdfIn PDF document text
    • http://soosanfix.com/upload/fckeditor/file/nofowereguporezo.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/kanetilizuxupimasuzare.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/wozewobanumitinekowake.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/kutonemivoxefokovupexe.pdfIn PDF document text
    • https://simorgh.it/uploads/file/fonapukeredisuzexav.pdfIn PDF document text
    • https://strechybenesov.cz/content/nadalukipofavox.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021923135213808.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/gesedikarubazufedu.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_off0000d99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99E 10500 bytes
SHA-256: 854555aacd34ea0a5798b0384fcb954e593da673c3dd3e5e3a8227f0fb87df7f
font_01_sfnt_off0000f141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF141 17684 bytes
SHA-256: 4bb9d305867b441cb37d9cd8e74fba7a7832d06e5fc206644a8dbf3bbff2de7b
font_02_sfnt_off00011f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1