Malicious PDF — malware analysis report

Static analysis result for SHA-256 de67b610e09491c6…

MALICIOUS

PDF

85.1 KB Created: 2021-06-27 22:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cd30e2925a0509f3189644a7c99b70bc SHA-1: 8fd33406a53295b58eb989a058dee153101019ca SHA-256: de67b610e09491c6223f80cda9ea0c7ce817230732ac1b452aa3cb2b6203f997
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bringem.de/wp-content/plugins/super-forms/uploads/php/files/6f4c6435c4e9e6b739b8593122bc613d/2356077829.pdf In PDF document text
    • http://akicgiyim.com/userfiles/file/dasipomo.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/femepatuwunatutafupu.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/0cjg82dfou0d69radaie02ujt1/92922270406.pdfIn PDF document text
    • http://okzawidow.pl/img/upload/files/38709607521.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77281e5330---77844305432.pdfIn PDF document text
    • http://zuche0551.com/upload/file/29008068485.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cba612219b---sarezakuzozifujokanusago.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/15257640919.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608efcc761a30---dezasa.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/xiveniroxigusuwewunegu.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67dace3c4---kenenapa.pdfIn PDF document text
    • https://warungmimpishio.com/contents//files/lidepinutalikanegik.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/01152946664.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608764c1a8c80---wexizexebipulaxebab.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde48a9a55---93953806523.pdfIn PDF document text
    • http://changju-hotel.com/CKEdit/upload/files/savitidagefo.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d809be58bad---mizukus.pdfIn PDF document text
    • http://integrotech.com/zdjecia/file/97513762419.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/jubaxanenapekojabivadola.pdfIn PDF document text
    • http://teenaramainc.org/clients/875997/File/nawogol.pdfIn PDF document text
    • http://domainecomps.com/documents/files/faxajuxedafipinu.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c318e98efae---bunitategezofodukozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=the+walking+dead+full+episodes+free+onlinePDF 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_off0000e972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE972 10920 bytes
SHA-256: 45bc5bcbaeff65a2a789ce25aa3d6c81fce81aa21a0decea0d16715879646c6d
font_01_sfnt_off00010281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10281 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 17012 bytes
SHA-256: 2f64a176a05ea3d35ab7c16acd376e7aa19a27a640035b7d84c567a5e443681a

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