Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaaa9cacefc9426…

MALICIOUS

PDF

94.8 KB Created: 2021-08-16 12:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f60e3620a83060de5e6728427efc722e SHA-1: 0ed1a7f1cbc4e0e4ccd61ea23e3762a85339df43 SHA-256: aeaaa9cacefc9426382e695676d74a6222c069ca4c1f60e2364824be1220ec2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users through deceptive links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://catamma.ru/uplcv?utm_term=fluent+python+clear+concise+and+effective+programming+by+luciano+ramalho+pdf PDF link annotation
    • http://csc0451.com/userfiles/file/20210726004813_n9i0if.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/54791657101.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a799465ed---vojirigelozusizo.pdfIn PDF document text
    • https://inncredel.com/uploads/55251066916.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/zodapu.pdfIn PDF document text
    • https://airbays.com/userfiles/file/6047059986.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/62a209b76204990e05389781cb79ffaa/puzivajemekovedewom.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/rogap.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1de2bb287a---vinewulop.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/93940615078.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/folitumuxixurubo.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/vigomipuj.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082840c45b53---38186557862.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/60630624885.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hklnqfjfeoev2sh07t28hshn3s/mivukabojumov.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ds1i0b9uroc0jeqkro2evcdbo9/45247113463.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0823bad992---6446856634.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/25355637395.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c424a1c03d2---92998004174.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/37677423589.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/23f47f6f0af45d16c2701d91d373246b/21680475754.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/49476980350.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/1548394b56bc422aaea10fa05ec731d1/xobagofisutod.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_off00010a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12217 11464 bytes
SHA-256: c9e66d8bfa7c7e6ebb5bf9a4337f2163e870299511d94883ddc314bd01082ffd
font_02_sfnt_off00013c96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C96 18084 bytes
SHA-256: 8480ec1889d905ceb3444c68a0c7e7a871691759e22910fe2bf44f747776574c