Malicious PDF — malware analysis report

Static analysis result for SHA-256 2dd8a9c23c8111db…

MALICIOUS

PDF

78.5 KB Created: 2021-06-29 12:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5344f178d21ef116381d66160be11c59 SHA-1: 584544605ef269e6706fa6566bb2a246c8b319be SHA-256: 2dd8a9c23c8111db47243488cbd7c14dff87889ee56772cebff46b83f1b20e66
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://brette-animation.com/userfiles/file/gegemiburunotu.pdf In PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/0660b01b3d383f732740effa6a09db42/rukusere.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/f53f2b06c5f320dcb678427915e9ae61/kegovusixuk.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41dbd118dc---66283114638.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/190247070960cc1614a123e.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/d236858e271c7b5037e26449b025f238/71116066041.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c44ee454650---sovomumulimovowenazaraj.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/puwijinokofamanexosawepan.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/76981371964.pdfIn PDF document text
    • https://samowar.me/userfiles/files/vafozelevolunoliwiguru.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7acb0fd7a---33235975444.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/jabiluwosujuzorij.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/rafadaguxix.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a021c46b00d---68332094857.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc70e53fe9---74373325368.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160819957b0674---16667855116.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4da607565---nozoxomuvekirafifube.pdfIn PDF document text
    • https://www.cittadelmiele.it/wp-content/plugins/super-forms/uploads/php/files/356710b89b6ac643c2bcae07ec7d12c7/lixurujitokifulutubobakuv.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/97dfff59c10697c4b776a986aaabbeba/97642653444.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d0c2dee0f---83241483776.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210605133350.pdfIn PDF document text
    • https://actor-conseil.com/files/file/54442635184.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/70ba7732d3943e0814093375f9b12150/fototavatasoduxexusofe.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdb56d06d---dotilajafi.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/3jbles1n7u1b6hjjipbi1uog37/28789975007.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=jingle+bell+rock+guitar+chords+easyPDF link annotation
    • 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_off0000cf19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72B 16836 bytes
SHA-256: 5e1c7e13c2851415dbb82a6a4c1093ad3d7f890409397911e730468dba74d1e7
font_02_sfnt_off00011332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11332 11088 bytes
SHA-256: 9a027b5b380b5572fd2f85380a14107a243e4b6bc7d4d524b35152ea74845849