Malicious PDF — malware analysis report

Static analysis result for SHA-256 4711943e06743917…

MALICIOUS

PDF

82.3 KB Created: 2021-06-30 07:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f4e4c691cb9468d66d859acbfa52f2f8 SHA-1: d78cb7525dc7309154d1dbbcf2e6cb068ec2b7cf SHA-256: 4711943e067439177ce39af799213b569bb6cd1b44ec1946954309bb928c4160
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or malware distribution intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://cructi.ru/uplcv?utm_term=surface+element+in+spherical+coordinates PDF link annotation
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/e870108c331da24be607d6899bf128ca/vulitemexovamu.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74a2231bbf---jusujitewivapavonerubumo.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/vozizowavekudonibixibomep.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/64842a01460af163ef74301a0ccb7b92/toget.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/hl41j1hemn8o59lqlfjsceiht7/semef.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fdee4e3e3---33181410003.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e66a01ae9d---73360645362.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b087d3320f7---rasirugibefa.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210603_110108_1182.pdfIn PDF document text
    • http://dogoxuavanay.vn/uploads/files/falalizusen.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4999d57ab6---mulapigavosutina.pdfIn PDF document text
    • https://agrolliance.ca/ckfinder/userfiles/files/13429347078.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba03cdb3afb---lopesajudogedet.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/nusaxozuzagexutezu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dd1e1cf7---xowoputipub.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/3378009962.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/37b77c9ebb0803c15e0551756413abf4/21609515001.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/firofugasalabulewoxoku.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/40901126849.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6da0e6a4c---27097928960.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/zinunevove.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c757fcba81---soluta.pdfIn PDF document text
    • http://dongphuctqueen.com/upload/files/fikogubo.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/dunekemitef.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_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07C 11060 bytes
SHA-256: 96fa0c7802ddda588368a13f4c22dc337a6a6dbd7678e65cc5c12922f405b328
font_02_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 17900 bytes
SHA-256: 5e108cde741100e08a1df430b903bab681ab8d3fdd283f440b89ed857b0b5e2d