Malicious PDF — malware analysis report

Static analysis result for SHA-256 9629c333baacf6bc…

MALICIOUS

PDF

90.1 KB Created: 2021-11-11 15:02:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 08a760e22ea34cbbad0d76aa10344ab9 SHA-1: 65e840cd49f5bb256f5ac43ac403caa6853848ba SHA-256: 9629c333baacf6bc6ad3588887b62fd00348761d99a595cf4478d07997b2a391
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. The document contains a link farm with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to redirect users to malicious content. The presence of external URI indicators and compromised CMS upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://irlanc.ru/uplcv?utm_term=wise+opposite+word PDF link annotation
    • http://trunghungplastic.com/luutru/files/33857803105.pdfIn PDF document text
    • http://architectureanddesign.it/userfiles/files/mirumez.pdfIn PDF document text
    • http://aurorabersinar2.com/contents/files/romugonamaf.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/3524208173.pdfIn PDF document text
    • https://stayinbranson.com/ckfinder/triplebuserfiles/file/82810248894.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/kanesiwos.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613e09a8781a9---jefukosirivoko.pdfIn PDF document text
    • http://khachsanmyngoc.com/upload/files/kexubane.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/19629327285.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/mojilavevapifanavaw.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/gitozekoporesu.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/18467132575.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/7245934468.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/pebufigogutim.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/jinikewozapali.pdfIn PDF document text
    • http://kdesignuk.com/userfiles/files/96301367207.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/92142349291.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338c7fbf308---62105190471.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/61096570174.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/badesimulimiperunagem.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/pinuroxefigopura.pdfIn PDF document text
    • https://securitydm.com/slicice/file/10977996680.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/difaw.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/403f7258453e9bcc25911456aa28437f/gubafiniwademupu.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/bikujakedikemewe.pdfIn PDF document text
    • 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_off0000fb8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8B 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef
font_01_sfnt_off000112ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AC 18680 bytes
SHA-256: 367c7f7e517db0163d15586408dcddc715a22f353a139be8e745e4451f1e61fe
font_02_sfnt_off000143e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E9 10152 bytes
SHA-256: b2e6a17337bb3fb392f30e8a5aeb3631972730dbb494fb87deb77f3ece3d33cc

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