Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7ba75b0798a703a…

MALICIOUS

PDF

84.5 KB Created: 2021-07-07 19:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a2965ff69083be87f4b011981ff5182e SHA-1: c29bb7662605dd8aabaedf2263300053807b1362 SHA-256: b7ba75b0798a703a6afc58570552270613dffbebeeda66ed89fe30b6f820e2d3
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL analysis are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=house+deliverance+prayers PDF link annotation
    • http://tutek.eu/userfiles/file/44301698886.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/762ccb31834b18c4c4411fd93eba1001/zonobarujezabifemelawatan.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/3738756736.pdfIn PDF document text
    • https://panama4d.com/contents//files/rejinopajasikux.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/94545888673.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/420uaf08epc99bjmusg3665u23/guzezakukixijizigarafiw.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/bcclb1qv1m50ep4fetki7ufcv1/70526367955.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/50077757010.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///92297271569.pdfIn PDF document text
    • http://loveperfectionschool.com/upload/file/jiboluwokaruretijikireb.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92986667cc---50382424284.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/497cdf406f6e862dd702857e20c6444c/kazofosaberazo.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/89465005755.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/58948070385.pdfIn PDF document text
    • https://castel.ro/userfiles/file/60221479707.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0d837dfb4---70428409345.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/99360301526.pdfIn PDF document text
    • http://au-zlato.sk/upload/files/81426013087.pdfIn PDF document text
    • http://angarakshaksecurity.com/userfiles/file/48589641385.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/modesuravog.pdfIn PDF document text
    • http://beepost.vn/upload/userfiles/files/15187121998.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/004k4gqb4nukou5kcpkat7u1u3/nugusi.pdfIn PDF document text
    • http://annandale1963.com/clients/69704/File/77701157854.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098c592c5a13---lejaramegababunowebomali.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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 10680 bytes
SHA-256: 4c09e8e34233addc7abc478b404e6d38da701a8964d73712f83c9612dcfe94f6
font_02_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 16656 bytes
SHA-256: 799c683e48e5e8ec25fdcdd94db9fbcacc67a222783b976a21ef3fca8eacb36f