Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fa29eff1fd43312…

MALICIOUS

PDF

81.7 KB Created: 2021-09-04 11:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5866b5993cd723e3df022b83e8715675 SHA-1: ccaf34c01f1f00252ea3c553714d74b1e2c505ac SHA-256: 0fa29eff1fd43312b0b9dde2d55b366690379b9beea02bc52ca0d157007ea2b9
164 Risk Score

Malware Insights

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

The sample is a malicious PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users. The PDF also functions as a link farm, pointing to numerous URLs hosted on compromised or disposable domains, likely intended to lure victims into downloading further malware or submitting sensitive information. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://oniceh.ru/uplcv?utm_term=manualidades+sencillas+con+hojas+de+papel PDF link annotation
    • http://ginzaramen.us/uploads/files/17087532269.pdfIn PDF document text
    • http://saydersan.com/firma/files/96433992495.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f62043f1f303e32f38a4ed4d6291f8e3/deritakojebujo.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/lisevamonuwanaleboxona.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160cf6c1a5f3f1---zukabetubitesetasabexeba.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5db9e6b209---65893591555.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/7843a113e686443523434d208b05e9d0/balezolu.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/wagiditivizidazusojan.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d7230d61a---65212554607.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/nudipilizutavuwalegolor.pdfIn PDF document text
    • http://come2menorca.com/images/file/xojuderuj.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a902fd6bf8d---kedizitakina.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160770bb47b425---jaregesukowonotofomuz.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/589213569.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/mavolaxotapebemawoxeve.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160835c099851f---bevifusabubobaxim.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mdsr6pmuberpnr07ojr7eljbjb/dajugefiwejadej.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/aj653vi7fem9ls5jc1b3c65sm0/59471415600.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210629124936_5umht2.pdfIn PDF document text
    • http://grafordexstudents.com/clients/0/05/05b3dbe7dd9dc6f92b523d2b721f2ffd/File/13726661835.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076068416f68---luvofupugejenigo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/13616470542a48445673d7ca5c39a2b3/dozor.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/50897384696.pdfIn PDF document text
    • https://annjulieskarpmo.com/userfiles/file/kimalufozemurifizoxilaxo.pdfIn PDF document text
    • http://5m-tti.com/uploads/image/files/fopab.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_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 18492 bytes
SHA-256: cbc85bae692fc11fdbf8c6aea8f7d8c58e3609f4a59d85220aaed9dcf1dfb6ed
font_01_sfnt_off00010734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4B 10636 bytes
SHA-256: e3adb660e576921cc3daf7fe8041393b0d2e94ebb4d557ef0b8772de8d032fb3

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