Malicious PDF — malware analysis report

Static analysis result for SHA-256 a17335cc1c09f6ed…

MALICIOUS

PDF

79.1 KB Created: 2021-06-20 06:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 45cc3358bf512b5da2b4e81c6e8fdb50 SHA-1: 3b370608c6c1d48b90e42ce8b18e509c2d3dedab SHA-256: a17335cc1c09f6ed1221cc4944cf59a0501654f1e064231512eff192feba505f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a social engineering lure to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/7e0f652be8f397a768b245cea0e2c988/13485960782.pdf In PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/78447229440.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wugadak.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/b1467d981cd2170b12d884824382cd6c/moninajowa.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609841e9e5261---xagivo.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/db487176b21eb8bc1c7265e6927dc52e/velijefifamovekora.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/loluputen.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d40747c92---47867982575.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/71497247370.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/58f07f5e62b362fee7db16b93d40c09c/76817552661.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/25887629907.pdfIn PDF document text
    • http://bjjiffy.com/upload/puvizabon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=download+aot+s4PDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DC 4252 bytes
SHA-256: b5a752972f0ac4d6ed6d38fcf53a1b6272cc7edc1a773ac6baf132b4eb493abd
font_01_sfnt_off0000d4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FC 4524 bytes
SHA-256: b8ce653005222da1e73f66566ac10d949e2a739e57165433902c9cc5d936cd36
font_02_sfnt_off0000e47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47A 11860 bytes
SHA-256: 7d0eee344c07578c066369cfd070558148c996571a23239448442c6e98153bbf
font_03_sfnt_off00010c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2C 16172 bytes
SHA-256: d64bc6380e0eaa1176cac3164d67defa127098331a48f6beb6813acb26cb21ee
font_04_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176