Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc28752b7d7cff4…

MALICIOUS

PDF

84.3 KB Created: 2021-09-17 07:18:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c082fc1a7ef588e11f7387cd689ff08 SHA-1: c8c0ef562f664ddc5eed3c7be319300a0c90b98d SHA-256: 3fc28752b7d7cff4c1ef332379676398c7c2c27a8ed3e22f4b69eea976e5e346
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external URIs and links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=x+men+characters+cyclops PDF link annotation
    • http://jdjcnc.com/upfolder/e/files/20210902102554.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/45802419967.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/fovuxix.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/2383351609.pdfIn PDF document text
    • http://vhshf.de/File/12014652519.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/6kcuevmfsrlpuksqma7gqbecnb/gasomomifemepokilogez.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/mizomejujaniv.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/e491dc93c4b04eed785e6434ece0ec79/735409997.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/ui27fl6ld4v5oc0skamq26kki5/wikivojepejotef.pdfIn PDF document text
    • http://infinivideo.hu/sites/infinivideo/files/46867342125.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb6e4586bf---gidimaremijujorefodifo.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/vazabiwumiwajexapabuno.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/zipotutomeforagulo.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/17044896596.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/370192773.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/2f060d94dd5c273ffedc18a24f946b51.pdfIn PDF document text
    • https://mimpidia.com/contents/files/kekivovumenujopofukugu.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/bosijixarowusefaluku.pdfIn PDF document text
    • http://zl369.net/userfiles/file/fefexoxododajolumezobexin.pdfIn PDF document text
    • https://asi-filter.pl/files/file/fexefojupasab.pdfIn PDF document text
    • http://scsytech.com/upload/files/54354228689.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/rekorotugovume.pdfIn PDF document text
    • http://esejsc.com/upload/files/dawuzinapizes.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f526a5e6ab---zitepisabobudezige.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/xuterevekuwe.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_off0000e5e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E0 10668 bytes
SHA-256: 8da10f8cb6382d1551b208062fe2541c34903397f7eb6f6a4c586ab506ce85e7
font_01_sfnt_off0000fe28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163A 17700 bytes
SHA-256: 5dad1b0fffea292e9c815ccd25d36274521ebf0b9f125c914c3837d73062d913

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