Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dd20e6c36e7bb8…

MALICIOUS

PDF

100.1 KB Created: 2021-09-19 01:46:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 60ef4d18828c41bb5c83e7120d4556c7 SHA-1: 986205267d49a47117f8957999118de8a4b7e49a SHA-256: c2dd20e6c36e7bb89818d6aabcf4b7d0abc644248ff62d726cd5ad296905e9ea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://philabc.ru/uplcv?utm_term=build+gradle+latest+version PDF link annotation
    • http://plusk-car.com/js/upload/files/xigagujosefaribe.pdfIn PDF document text
    • http://cocoal.com/uploads/file/papenopozasasasatuganajof.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/85354617927.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/35103011357.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/afggdiat7t8ph9rlkqelbj819l/45963088772.pdfIn PDF document text
    • http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/25440735235.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/nivulanepafuvo.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/30975720638.pdfIn PDF document text
    • https://phuquiland.com/upload/files/zopusudilirexile.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/tapag.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344e40090da---50525962667.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/57411254540.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/60851677283.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///17111256167.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9f85d30dd---58842554304.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210917_01199234EE0E6871.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/88232478166.pdfIn PDF document text
    • http://sbairs.com/datas/files/28195877374.pdfIn PDF document text
    • http://konberdbio.com/upload/files/vavawoxipuxodanupubu.pdfIn PDF document text
    • https://hongming-eco.com/userfiles/file/76604260670.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/nugimogeximivarepafozeb.pdfIn PDF document text
    • http://adice-area.com/pictures/files/zefekaremo.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/62892591639.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/30901842756.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_off00012315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12315 10644 bytes
SHA-256: 18c3398610459e8c14e1269f27f1afc56494d38bc9a89415106d4fc147b5f92b
font_01_sfnt_off00013b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B68 17884 bytes
SHA-256: 0117906d7a45763af736167c4ed3d81005b41363f9ecb01d1dc7df9b4a99d88f
font_02_sfnt_off00016a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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