Malicious PDF — malware analysis report

Static analysis result for SHA-256 430becc678e0bc5e…

MALICIOUS

PDF

97.1 KB Created: 2021-09-10 06:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e2933a62b6d988d5498a45b975bd0387 SHA-1: 0a964f5cf909ce09b5a0376a0ba33c6f27e7a4fe SHA-256: 430becc678e0bc5e20148d4a811139b47c1bf76b4ff60206507d01e3fcc06ac6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially compromised or disposable hosting suggests an attempt to obscure the true destination or evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

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://telorgabus.com/contents/files/33091249890.pdf In PDF document text
    • http://wefocusdesign.com/upload/files/narewuj.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0df7c71e9---83867985739.pdfIn PDF document text
    • https://onlinendttraining.com/files/57543158199.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/22499235241.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135135e2633b---42112812320.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131864ca140b---54353874849.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/kubugikideroguku.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/lamamuvejitusikop.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/1905745392.pdfIn PDF document text
    • http://hypotekaprezamestnancov.sk/res/file/32715011956.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/58058379518.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/3f03aab23677e65ba357f08265c2ee1e/luxedekegerupebobeli.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/70142634469.pdfIn PDF document text
    • http://hyundaihungthinh.com/uploads/images/files/13983032782.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/katenir.pdfIn PDF document text
    • https://vleek.com/uploads/files/43049239416.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/denodufisusopuvidajev.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ab1a182e---86163901200.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f95bf6f212---14757717238.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/93071720580.pdfIn PDF document text
    • http://fukaofoods.tw/uploads/files/202109071925028080.pdfIn PDF document text
    • http://knipia.com/userfiles/file/janexewew.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16134cb1e07a1f---46792642114.pdfIn PDF document text
    • http://ihdbd.org/upload/files/baragapopaxi.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/51512067233.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/68819243052.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=team+sonic+racing+mobile+apkPDF 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_off0001136b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1136B 19572 bytes
SHA-256: cd143d667b2c2d5484a9748d4236b8bd35baab2a6edbed5bcebc5501a7e22a96
font_01_sfnt_off00014636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14636 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4D 10812 bytes
SHA-256: dbc763bd3d5732ebd8b4c9a3ea6a04dee1379e47c3939d03596087d46e7fa9f4