Malicious PDF — malware analysis report

Static analysis result for SHA-256 c80a36bb0504429a…

MALICIOUS

PDF

77.9 KB Created: 2021-09-05 23:25:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0fbd8b0c24fef637d7c9ffc3a8683031 SHA-1: 6cc21967da9cf7a32052fa11565c7340566cbdbf SHA-256: c80a36bb0504429a54ec1beb0fb8ab8ab3a3cc758263ba56caf70a7b55ac8494
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://dilimkebab.com/userfiles/file/34304730433.pdf In PDF document text
    • http://daiichibus.vn/uploads/news_file/92033508628.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608010efdb0e6---98044572404.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f79471b4715---23812223517.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/78174997643.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/64389882009.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/40596802593.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/uq6dtakvrcfdukg18jf4hjbs6m/fewesaneziro.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/4c944fda8bc4de1bf60208994dae25c5/40627360887.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/64041313423.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/libuzemovubizomafuzuti.pdfIn PDF document text
    • http://www.hussco-steel.com/husscofiles/files/wixuvofaxowikore.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608335bca2f42---36056275090.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/5af8e89257a735b9b17d732229eeaf82/penexesudam.pdfIn PDF document text
    • http://kbchina.de/upload/durepamutewoxagipufani.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/j1u8cvbm0ujr3q9dta4l7a7u4g/kubolujitobovigib.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/4d19b68a1f0b44dce476c78b10475ec8/35281473375.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/33059861088.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/utstttr6nfl4dbntvlb1v6pi4u/19637660798.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/xagibaxiximaki.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d8508606---dulosasufepuwok.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/4058492433.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/54384537912.pdfIn PDF document text
    • http://toyotarenta.net/FileData/ckfinder/files/20210803_5CC5ADC7DE0A4CD4.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/14717120782.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608531c521f32---38582543476.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b017e7099dd---89321491048.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/17706350335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=stairmaster+stepmill+7000+manualPDF 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_off0000cca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA0 17308 bytes
SHA-256: 052d696eca918e51f071aaf293703785bc3345ae41f920b2c575fdb9e3af29a6
font_01_sfnt_off0000f939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF939 10640 bytes
SHA-256: a8f3c162693c7dfecbb43beafb82f1f84812f3cd33a99cd5615b01c1434acad7
font_02_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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