Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ee6f9c1280bda9…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 15:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 25762e20318bf39803c6929aa4749242 SHA-1: 18b393734de4bdad86afeb60c383a4f85172de1b SHA-256: 65ee6f9c1280bda94621adb7e941e4cced304280e3378c8d23a38766ca413695
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or initiating malicious actions. It also features a link farm pointing to numerous external URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to phishing or malware download sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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=my+lady+boss+full+movie+stream PDF link annotation
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/ogandp9dp3aqvtqkfn0ahsq9p4/guguwavukab.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/88901905127.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161425c75472a6---27952499087.pdfIn PDF document text
    • http://architettosirocco.it/userfiles/files/xamumuduloxerijivasug.pdfIn PDF document text
    • http://taociren.com/upload/file/210906073248165751g2ytbbmm5pm0.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/79361699289.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/temeluvevexiziroz.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/42470011414.pdfIn PDF document text
    • http://fuhua.tumujike.com/assets/upload/files/202109141618259550.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/9003501489.pdfIn PDF document text
    • http://saveursetsavoirs.fr/image/file/33757937833.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/88540848239.pdfIn PDF document text
    • https://siroyensao.com/upload/files/foxepunofoxefavapogin.pdfIn PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/zoradulagisexufijizi.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109060458529254.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/9k6nqirsnr4masb331kh1e0hp2/92742961183.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614400f30282a---zudakaleluvizurasemupad.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/5569491748.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/65109518612.pdfIn PDF document text
    • http://asu78.ru/userfiles/file/65794048572.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145b8c8a9e36---47412162660.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/togozuwiwapeboki.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/pininude.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_off0000eea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA1 18048 bytes
SHA-256: a9a67e972fd9e32d6f21e4624510a876af3de36af75e397100aaa41605d4c314
font_01_sfnt_off00011d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D98 10824 bytes
SHA-256: 97443c30fcf9fb67a68131627f7582805559506046bdcf4ca9996499baad092f
font_02_sfnt_off0001369f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1369F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1