Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c16637b8a15fd9a…

MALICIOUS

PDF

80.9 KB Created: 2021-08-29 19:55:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: acc72791d2f637bf134eaf906065a48b SHA-1: 95b58a83861f7263bf4b93feed95957b4a5c63b9 SHA-256: 1c16637b8a15fd9ae42a209f77c2228bcbc759dd280c381f42e452227d7f04e6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress upload directories and other disposable hosting. These links are likely intended to redirect users to phishing sites or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/vstijhnoqr6qhun42bni5354gj/11690013656.pdf In PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pn7u6s7knrono7pvso6l8f96fq/34526480561.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/61703103819.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/44158824935.pdfIn PDF document text
    • http://cutskytools.com/d/files/20967406447.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/33253111980.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3bb44ef8b---pibagijeso.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/b29b4053e10021cc4eae6fd272d960ae/47671785994.pdfIn PDF document text
    • http://cabini.it/userfiles/files/petikuturorawegepi.pdfIn PDF document text
    • http://katachizu.com/img/news/files/57132459874.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/wilibikatato.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/cthnf3kgemjf14g4flkogomcp7/wakidepis.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16089ef8e3e666---68858253971.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc171f315f5---sewojusemopisoz.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210805202906_235369.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/67893110071.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/sawudu.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/sitefuvapukexuwajoriru.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/5a2386b4b0b966133775ecf65e068247/zinusavagimev.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5f6643e1aadf2dabbd406bd2408fba35/73473268767.pdfIn PDF document text
    • https://arerp.kr/data/file///80592593217.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/derukupuru.pdfIn PDF document text
    • https://menu2uplus.com/images/file/7369539678.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=cengage+owl+chemistry+answersPDF 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_off0000d3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E5 18656 bytes
SHA-256: 316f46042a7cdf5692700d3e04cd2c6092cb774634bfdcde3ca1119c0aa52908
font_01_sfnt_off00010475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 10908 bytes
SHA-256: e4a2de6893eee0d54a2879dbf3843ec71585e3ec5c3ecc05063418ee89eb1682
font_02_sfnt_off00011d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.