Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7d5590745f6385…

MALICIOUS

PDF

99.5 KB Created: 2021-06-27 02:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: bcdee17221be18a95a29b7ba02210f87 SHA-1: cc761e8d4732186875d4261d7b8c35fa4e7ae972 SHA-256: ca7d5590745f63854ff8ca29c9164f827c12dab2402b1b62432d61efe60079ed
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm pointing to compromised WordPress uploads, likely to host malicious content. Crucially, the document contains an instruction to disable security software, a common tactic to bypass defenses and facilitate the execution of further payloads, possibly via embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8ed69aa90---79075631278.pdf In PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/ee57fac9bb79404e5f92178d9966d159/52350364759.pdfIn PDF document text
    • http://www.bash.cl/media/file/93693829527.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fcb88676a---kameligeniwaf.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1708815114d15fb3c0f82d44bef6fabc/92060189201.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/wevegubaxerajitoxabupibu.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/e3f7f3d160602e3088a9df5c0dde308f/89655154941.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c9c6a4d65---gosanorizivejunokofanopo.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/73674835605.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af49117a57---zaluzetuforozavarag.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/7h5c7dg201t8cnmd3l8jbspcip/28112523268.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/fiketukefibere.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/cfac061e0fc57907a8f97ac5b1a49037/nutisoremugo.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/daed5d2a631290506e5fba0f5a942634/fokuxilaziwakebujaz.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/d61ff952331eac2b1b6e6c9689becfa2/415778687.pdfIn PDF document text
    • http://aven.su/userfiles/file/33495160793.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/999d8ab69fb3dff2201054a3ae3d05dc/kupewulakexedut.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/on0j4jn3qg808cg8ehil6qq1gv/gakupaniveg.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/2773c21642f073f8dad3e9c2bd0a70c3/nutafuli.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f5f20a3ba5---78598119296.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fef4d4beca---3504231563.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/97729591814.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=site+engineering+interview+questionsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F8 18012 bytes
SHA-256: 3d028ce5ff3bda3ce7d2b5e3edf73e761ce87772ff98b31fa63982154242a73c
font_01_sfnt_off000150d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000168eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168EB 10548 bytes
SHA-256: cf474aac52b99942f4ffe2b8b4f26aa9626b8de5620c4ea09b7923997e755dc6

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