Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b59ebbd09af482…

MALICIOUS

PDF

81.3 KB Created: 2021-09-04 18:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9de005ea9d4fc24b3684265dee542886 SHA-1: c89a77f663b185ffbcfebd52efba3fe34672fb71 SHA-256: 83b59ebbd09af482e6490857435b946e5e7c412213cb8a78e61d667b46578d5c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://neksav.com/upload/ckfinder/files/8814507337.pdf In PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/vaxebafazidasuxoz.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7b1d10fbc01f079e05a202712199d5f2/bijijosazezivitefijadasum.pdfIn PDF document text
    • https://manenshop.com/upload/files/toditujovegakin.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/vijigokijifo.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/fd524c4e75982780030d3cff5bc2f1b7/nogis.pdfIn PDF document text
    • http://nct-vn.com/userfiles/file/gidexofitubo.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a82c6331a2---52440682949.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/dotonitoki.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/73603886772.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/60598420507.pdfIn PDF document text
    • http://clarksville.net/wysiwygfiles/file/24971274170.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/acfihhsri9auhnvi9s3p24utsn/57085950639.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/zagogimul.pdfIn PDF document text
    • https://barcelonamedicalcenter.com/files/galeria/files/bajagexatiwemipolipa.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/41347972682.pdfIn PDF document text
    • http://www.celso.org/download/75198974233.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/xukiboxaledusebe.pdfIn PDF document text
    • http://bdsductri.com/upload/files/puriwebovawin.pdfIn PDF document text
    • http://osteriadelcampanile.com/userfiles/files/48930336490.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/o600itme1b1hvfpctgvp2im32l/pazug.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/77243689293.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/161004d9e9cbd0---51544739160.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/4674534075.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161252380d58b4---betoro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=diesel+generator+maintenance+pdfPDF 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_off0000d840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD840 17548 bytes
SHA-256: f131afaa3715926ec8ee61ef616711942588da7dec1614ecc21eafe5bc284603
font_01_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0F 10964 bytes
SHA-256: 9859620cf38b2de1467fa253e0f8c2c96feff5b63016eebd242d08ffeadf60e9

Open this report in the interactive analyzer, or submit your own file for analysis.