Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6793f77e0dd17a…

MALICIOUS

PDF

95.1 KB Created: 2021-08-10 01:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 91243c7cc663181b1fd89d7cc12f36d4 SHA-1: b44a8de9c4c52c2d70ae0a85809bdd2cc56f3166 SHA-256: 5b6793f77e0dd17aaeded1350b7db91b3dbd34773db6f51ba64174792a7437d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a phishing lure or a distribution point for further malware. No scripts were extracted, but the structure and URL analysis point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://nomylo.ru/uplcv?utm_term=baixar+jogos+da+ppsspp+android PDF link annotation
    • http://tmtechvn.com/webroot/img/files/nezagiwurukugajevelu.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/nelolomibogowur.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/ge30vbkeap661j67h4edjl1eq7/61042915454.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/51245042542.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c2550f601f4---21830713935.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/gosike.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/01b4309e2f126e6096ccd54ab1f7a491/85339676881.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/f5a438c0cbdc9e8a0ec0eb65ca6fe551/88573639773.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/22346902899.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1bf731aa1---72900742167.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/90358541909.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/39750888437.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160739e1dedd96---sizodutox.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609185a7a3d42---58403889937.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/20384015884.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/getasel.pdfIn PDF document text
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/rolowa.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/zukusoregaxozemi.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/0dd6e4b5a9bdc4fef6cd75860ac5a23a/74103495411.pdfIn PDF document text
    • http://schokozentrale.de/idata/22712152651.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/54273659208.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d3e094e38f---22332179701.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/9c1169b9f9b55bd6a867d2a6c24bcbf9/39325856828.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/97969554791.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afa465c379f---lepevatuzonevadomijopaxi.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_off00010b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001237e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237E 19480 bytes
SHA-256: 0562fc6b3fc8ef92e4f20a543ed320e73251c0a7097b51a0be632b0659eb611a
font_02_sfnt_off00015439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15439 10576 bytes
SHA-256: 9bac7951f8f3cfe0d9017b9e85e4111d9319f16f7e274170e4957d3d7c3959e1

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