Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8f0e9f598b2c129…

MALICIOUS

PDF

76.1 KB Created: 2021-09-23 00:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 16cf795ee0c755c71b29f045e5eda6a0 SHA-1: 4b9a7f0eb884994b2aa7a6bf1e33cca795b9f8b8 SHA-256: c8f0e9f598b2c1297c656d0d46bc69d43c16e0762932c7337b653b0ffa4d659f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple disposable hosting sites, with one URL specifically referencing a compromised WordPress upload directory. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading malware disguised as game mods. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://locktactyuma.com/ckfinder/userfiles/files/gekifitufefosasoginufovi.pdf In PDF document text
    • http://gemculture.com/userfiles/file/zafut.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210912232852424542931el.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/88260179463.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/wedinivufuwag.pdfIn PDF document text
    • http://roland-toys.eu/userfiles/file/nirupolaxeroxumiluxagig.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/73425584859.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/59381609029.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/sikesaditikakogaj.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/59459951080.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/xosunaxozalib.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/96663626226.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/161421a2333969---tumoxixu.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/rotisilolisofem.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/sifumenisixeponixiw.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/In PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/kamoginazidorupuxu.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/povoxedexekurisoxavupat.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8aa5810e7---36628778478.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/73685573670.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/ludagazifuxipamomonida.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/jesagosevilizaju.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614972aaeeb17---dedazelekotiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=game+of+warriors+mod+apk+unlimited+money+and+gemsPDF 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_off0000c4e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E6 16920 bytes
SHA-256: b974c15ce9f6540bc47f511bb0b131961f1a58c655ceebd884d0facfc8d191d6
font_01_sfnt_off0000f065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF065 11272 bytes
SHA-256: e58d13b206d32b506de4740d8e37a94926f020cc7676b4e5bb0fae7d3d7ee0bf
font_02_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1