Malicious PDF — malware analysis report

Static analysis result for SHA-256 4905be3a75f5a5e8…

MALICIOUS

PDF

75.8 KB Created: 2021-09-28 10:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7f2d8669cdabd15c1b7efb5b5376a19e SHA-1: 6fb08d89a9c35676e9b6fc1ec48e89c09ba4167c SHA-256: 4905be3a75f5a5e860a88c671f0c243c8dd3e669ce923647a7443ec909a46391
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://crewmak.ru/uplcv?utm_term=amazing+spider+man+2+apk+data+download PDF link annotation
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/8095780681.pdfIn PDF document text
    • https://gsacademy.ge/uploads/files/25159837342.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1614f386b53ece---vatogodosojofasinefipomop.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/fedalasurameliloxizaboz.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f174bc7e---70567895631.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/wasiwavolazede.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/53925732914.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/bivajigoredas.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/bukunam.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/wavojotagonexiveke.pdfIn PDF document text
    • https://thenovgorodspaceship.andreirozen.com/images/files/devatinamaraxaxe.pdfIn PDF document text
    • https://sunkamalzemecilik.com/userfiles/file/pubowobebiximunubupevad.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/47886271404.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/depobamolevufipetebokal.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/sefoxatavufajojirubojebut.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/g0c27loqc581cedcelbpibvsb1/92203024481.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/88577354340.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d7594c2cc8---fodizegajesobigel.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/logemuzuzefureduwize.pdfIn PDF document text
    • http://jump360.co/upload/files/20210925031710.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/b38ddeb7f38afd82a23e3e361a56f25c/43364129397.pdfIn PDF document text
    • http://ymmicro.com/files/files/81702417502.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_off0000bde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE0 11076 bytes
SHA-256: af2db5f9ee8ba83b88abd7b146f0c2038820299701d16b2d852d4333b9c1eaaa
font_01_sfnt_off0000d79c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79C 19436 bytes
SHA-256: 74236c99a9c91d1b02aed5a90a5cc71031886f72bc35a9b54c780ee353241d30
font_02_sfnt_off00010929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1