Malicious PDF — malware analysis report

Static analysis result for SHA-256 27fafb4b1c9b3865…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 01:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fca0786051b3f59f4d1fea777165a3e7 SHA-1: 515346b6d291da9dfac33a127b7b007f36fddaa7 SHA-256: 27fafb4b1c9b38658127118392bfce9e61a3e0fec5d7dc56a74b5c1d0c49692c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics confirms the document's purpose is to lead users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=8+hours+of+sleep+but+still+tired
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/8b2fa863efcfa8a3028bb8eb071f601d/gujiru.pdf
    • http://bahtiyardishekimi.com/fckfiles/file/gugevazijerifasowatinas.pdf
    • http://honyi.tw/ckfinder/userfiles/file/balika.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16072ddc99057a---xojasifozeneru.pdf
    • http://singer-island-condos.com/userfiles/files/21410114983.pdf
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c752fe40bff---tinugeroxiparupab.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/u9th1hb9cq3qah5i2klca0rgsi/41725725121.pdf
    • http://bhk-aindling.de/userfiles/files/rosofigobidilitoxuvi.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f27c8dc643---34100011143.pdf
    • http://stylekd.ru/files/zefufafegorosavonojem.pdf
    • http://border-inn.com/CKEdit/upload/files/6408977720.pdf
    • https://xn--fiqa735be48e.com/upload/files/nokadajetusegikoreneresi.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3dbd41c92---10347825285.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c74584e0a93---konetewuxanebirizupimo.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eeoq11ksnpvogtjg5r7qns0pl1/wevimejid.pdf
    • http://jandebruijn.com/uploadimages/files/dasopixuvuzituwusigetut.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/ab15f0bb5cd4a346468d869edaf1e147/lenelojigisulezapaze.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a11f7ef4f6.pdf
    • http://benly-carson.com/product/files/32841045005.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa4081399e3---xixarawuf.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ct90v9pqasd0rc5tkf5f7kpu3j/dipomulutimiluvuvozip.pdf
    • http://absigorta.com/E/file/gatizinudo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9e3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E3 16792 bytes
font_01_sfnt_off000101f5.bin
34f59efeaa1f7ac7eb78dc98e9864297f790cdc59d24e8fc1849810a605008b9
pdf-font-stream PDF embedded font (sfnt) at offset 0x101F5 17144 bytes
font_02_sfnt_off00012e90.bin
972ebe996a55294d8814434b39bdaefde651370d9cf4cfdb036ca230c6dd084f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E90 10680 bytes