Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d359f5e56a231f…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e11a673a464685ce1a71a7b7f97adbe1 SHA-1: 6d94a956f5193d641c735870aead3c5001aed7a9 SHA-256: e7d359f5e56a231faf7c8d2391f0383a966e2053635580233dc3bfffefdde577
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress upload storage and other disposable hosting. The primary purpose appears to be redirecting users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://brixtontaxi.com/survey/userfiles/files/rurutifomol.pdf In PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/61368027952.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/d0c89545a26d1ba1b872d920845adf78/49618576738.pdfIn PDF document text
    • http://demkapi.com/resimler/files/13946892050.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/64670322635.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210831_214134.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/79109432017.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efa11910b9---kabijurevefaximuk.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/93247684273.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/79384510975.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/72315112971.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rujakej.pdfIn PDF document text
    • http://ymmicro.com/files/files/31496723598.pdfIn PDF document text
    • http://s4l.vn/storage/ckfinder/files/36811445335.pdfIn PDF document text
    • http://studionegro.net/userfiles/files/71086567533.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/63302376144.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/31409008848.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/vigopugowod.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/96757771622.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/d5528a081139d8392c929698f4f68bc4/kukisekoxaxuduzo.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/68220354142.pdfIn PDF document text
    • http://ceramvetro.net/userfiles/file/10345456426.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/gukobured.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b24f56423---8967252162.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/42434416118.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210905_A3A0E21423CDC1D0.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=free+coins+in+mobile+legendsPDF 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_off0000d49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 10568 bytes
SHA-256: a81c9f472d69474cc4e041c0d6bf849533c741afab8c0ddaec2fb2be4110ffff
font_02_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 17228 bytes
SHA-256: b79ad8469ed1f805cd1def755548ce736874a786d64e61b6181fa5f4cc5e88b6