Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3503c2ec57a2961…

MALICIOUS

PDF

94.3 KB Created: 2021-06-27 12:18:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 8862b95b2c0f3177f9e0c61df63b3ba3 SHA-1: 1154463a81529c50a8360391435ff6a9a22c36e1 SHA-256: d3503c2ec57a29618e8e9ab0b7f3eca479d9464a621480294b38567dc30155ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload directories on various websites. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e852e1fe---77670617990.pdf In PDF document text
    • http://nhatminhtrading.vn/app/webroot/uploads/files/41978791700.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d84ee93872e9ddf316695a838cf65f2f/ketewazela.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/58663075630.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0afd74f96---lazuviluzuzetirovato.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/9f6899ef679ec079646e745c0b0bc5e9.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/37003778404.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/tikudasenelavasex.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/2bdcbbc99451e327e3bc6cc86bfcd6b7/gilijisafevuzor.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160adce0bf157d---gisodifadakodaf.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745106906e8---ribexiluwusanumunaje.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04b125163---64443527109.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/49716771534f7ef7fb07bd1563237155/tibodapu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae66455926---kebol.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe72242c1f---83730154154.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/lejezeve.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805007ee4a8---lapegemidixuxixukata.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/kipum.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/cd92d8970a1a26df300bd54a1ea41a54/sibonedonigezus.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622261659.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/dekevimube.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/16868621109.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/25793816485.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/f5a286d88b642721791af14f0bee701a/20025271391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=repugnance+meaning+in+bengaliPDF 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_off00010b26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B26 17996 bytes
SHA-256: 26c9f45761f6c5cb260fe0d568851ed13499448d267d485d0796fdaaab48cb16
font_01_sfnt_off0001398a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000151a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A1 10516 bytes
SHA-256: 1d86f927c3ab7f1331e7ed7fb9b8bea28e8f20ca11323c9afe65b1175989f7b0