Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47dc9aaa16f7bbd…

MALICIOUS

PDF

89.3 KB Created: 2021-09-01 20:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df118a112ace47b793a50bc8aa3bae5d SHA-1: 3ec3aea4fbba9d0525ec9ab298bceece5b4bb87e SHA-256: a47dc9aaa16f7bbd066bedbf40077654ed22c483eefcb415c9bb85fb22c48705
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites and link farms, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to disguise malicious links and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://queure.ru/uplcv?utm_term=tarrant+county+property+lines
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/bb633b8e907dc5b1ea377bd3253f6fcf/wawapu.pdf
    • http://whs1979.net/clients/65916/File/97527345878.pdf
    • http://adamlegal.com/userfiles/file/bopesiguguluwijufomubuzub.pdf
    • http://aceonlinementors.com/userfiles/file/56707242309.pdf
    • http://creativetechno.in/userfiles/file/1600351289.pdf
    • http://parejalecaros.com/adjunto/upload/fck/files/85928407452.pdf
    • http://tageedesign.com/ssmpt/documents/file/fiwawakawaduputodepa.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/tojotuvarazepajinemesof.pdf
    • http://archi1919.com/smlclub-files/file/ranas.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bc37770e9---toxuzadazebogajuno.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/08aeb177754e396c25a0d650c8f3d138/57252154626.pdf
    • http://share-world.tw/userfiles/file/19685804854.pdf
    • http://www.amedna.com/userfiles/files/35206685524.pdf
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/0932b9296667870d3f9a30654d9e6e5c/sazewaruwekenivenozuvaf.pdf
    • http://fuga-hotel.com/CKEdit/upload/files/41737771890.pdf
    • https://x-software.cz/data/file/93875885695.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/7d9035460ead38b02532a4fdf65bc872/mudogoxuxupametirabuvu.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b88a1f86b---58861384262.pdf
    • http://cnmrobotics.com/files/files/17834806746.pdf
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/22583484365.pdf
    • http://russia-ex.com/40257525488.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/52464037711.pdf
    • https://vieclamxaydung24h.com/upload/files/dadulupexevuvimofagelis.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/16bc34fd835db2d3063ea43976d50e72/51980559249.pdf
    • 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_off0000f857.bin
12f0aa62c65c5cd0890b47a608e0378884016e8d7d834ca0e74e62977a6a3f29
pdf-font-stream PDF embedded font (sfnt) at offset 0xF857 17416 bytes
font_01_sfnt_off000125e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x125E6 16792 bytes
font_02_sfnt_off00013dfd.bin
26ee03dc179f68fa56de086b0a6e99b2cd25d2651d6422b9fe9215eb114d50a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DFD 10544 bytes