Malicious PDF — malware analysis report

Static analysis result for SHA-256 f151c640d8e9063a…

MALICIOUS

PDF

71.0 KB Created: 2021-09-01 07:54:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b2fd75f7940dc7c527a640e050eb65f SHA-1: 519fd278d06b1805a09a6ff5c8d3ef0beab49992 SHA-256: f151c640d8e9063a12b9b3e22df2dd837d02bff0ac0bdbaa002631305eaa3a4e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple unknown URLs associated with link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c99ff9084f---gilusepufebodi.pdf In PDF document text
    • http://xycrusher.com/d/files/denopuzegubovakixed.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021051905471573499.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082288cd918b---boruta.pdfIn PDF document text
    • https://anfauglir.com/images/file/tozemidujigumade.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/6323422241.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16124cdfa0e441---davup.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/62864249932.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/54656800921.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/79d7e91cf864ddb3ae987aebed3f9bdd/satezasunazar.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/lipowamog.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/mekafetapulemixusuwa.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/39255894694.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16109dacc80446---14831279617.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210728140338767.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/24509242502.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/d9eca5382f4378328f2b7f00269e6a5d/pataduginujijunoguwifivak.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/a59a62f41edc337de80c9c081e135ac7/8571469397.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/83338835223.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/41871002849.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/konurujixo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=where+to+mail+federal+taxesPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/67147230771.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_off0000b643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB643 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE55 15564 bytes
SHA-256: 56d41d3ebad490a99302380863544e9276525a897202df3c05f4a03b5260a1d5
font_02_sfnt_off0000f5ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5CE 10612 bytes
SHA-256: db358a14b06954e3c8452522147b7f78c3c5f48c9feb9e9939062dcfc1faaf2b

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