Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8dfb999baffb5d2…

MALICIOUS

PDF

87.5 KB Created: 2021-07-29 20:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 9d19fa81825b44a003660c98513f2c34 SHA-1: c01116fc6542d82a116f1f83f9facf333c4d860d SHA-256: e8dfb999baffb5d2fd1edfb7658ed6351b18a435eb563bf7e7716777e511c930
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress upload directories, indicating a distribution mechanism for malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The presence of embedded URLs and the structure suggest it is part of a phishing or malware distribution campaign, likely using spearphishing attachments as the initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a03665df7---23455032051.pdf In PDF document text
    • http://apexnepaltravel.com/userfiles/file/zavewinifomemofuvilumupu.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/denoxujozid.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/jetenavubupodofujisav.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d05067ab255c71c0dfb1e9fb8a8e5081/lidavudapigabexopibi.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/33f203a025b4d1589ac63077faed0f18/gexolepibibasu.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/90722247230.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/82773944777.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098914850f44---lozijafukutizazas.pdfIn PDF document text
    • http://mtlebanon62.com/clients/5/5e/5ee551a8be14a26d7d76bc5e90dd1372/File/warufokadave.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160def42273802---25130768541.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/fozupixejewixaras.pdfIn PDF document text
    • https://badoza.net/userfiles/file/60528284439.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/xaxixawesemidupu.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/pexibaluzibekodu.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/47577800399.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/34165712913.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/32633480959.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d5f98af09---wineruvikiwo.pdfIn PDF document text
    • http://valeneighbors.com/userimages/52272461377.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/3554334187.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608348b12e938---ludaradugozawebaru.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b8b8cb8bca---89480407525.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/nagulipu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadede73c6---17542228755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=barney+and+friends+theme+song+reversedPDF 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_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 17380 bytes
SHA-256: 615286b70ddd1f71b3ee4c687c6a58dbbf5b963bdfd86dfb513dadb8cd6fcbab
font_01_sfnt_off00011eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAA 10988 bytes
SHA-256: 7f17468efb800b5288e7d69024b256f71b87234df94ad0444fff3286d166e46f
font_02_sfnt_off000137dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1