Malicious PDF — malware analysis report

Static analysis result for SHA-256 12dcfe9a62b9334b…

MALICIOUS

PDF

83.8 KB Created: 2021-09-22 09:22:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d52dacb0ce796ecf2a45a1ab0a5ca3b6 SHA-1: 51297299203a9d7402979a6362c20b2c72f1a9a5 SHA-256: 12dcfe9a62b9334b75fa70886106d067571d051d9e4af264287e0e0175d5605c
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 compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=ap+physics+past+papers+pdf PDF link annotation
    • http://tccsrl.org/userfiles/files/10299631646.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/54720575821.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/peneravobebiverew.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/wipejusatexukitobebuwogar.pdfIn PDF document text
    • https://lapakunited.com/contents/files/dipuxalegebokejizapaj.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/81a5c889236190e0a0273150a0394692/bukifubiredegotekizebeves.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/wefejodezugogi.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/13572295333.pdfIn PDF document text
    • https://greassi.com/editor_upload/file/11628152334.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613257405a62f---76661095792.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/46101372736.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/wumulinoxubiselitir.pdfIn PDF document text
    • https://masihpt2.com/contents/files/xabiwukuzuna.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/dibukukimuteguli.pdfIn PDF document text
    • http://darstin.com/userfiles/files/2569860258.pdfIn PDF document text
    • http://asustainable.com/global/file/genig.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/zuwegogobivetewavosuloj.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/xesanomususojuduwaji.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369e50f2d34---58834832474.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/zevuxaruteposunese.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/45532122947.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/56053528903.pdfIn PDF document text
    • http://exms.fr/sites/default/files/file/85413509603.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/bubowakigorelumisofuju.pdfIn PDF document text
    • https://lorus.rs/files/59908004496.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_off0000dc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 20168 bytes
SHA-256: 127347fc15bfee7991f6dc48ef7fafdd7d6d446d3856f99836599df03f4d8142
font_01_sfnt_off00011145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11145 10540 bytes
SHA-256: 14f0076b574b9ef7a83ba66a2c7557019c05907d0b8664314983236477df27de
font_02_sfnt_off00012985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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