Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dae3299820904b3…

MALICIOUS

PDF

80.1 KB Created: 2021-09-19 12:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1fdf90dea764e10670426a96d81e4c34 SHA-1: 63fc012a254a341ca95240d0d78acac200ef0d01 SHA-256: 9dae3299820904b322e9a9699af53bc72f4bdcf783e86c554d9745bfd674874d
176 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://chcial.ru/uplcv?utm_term=how+to+transfer+files+mobile+to+laptop+via+wifi PDF link annotation
    • http://hicoweld.com/shop/fck_file/file/movoga.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210903043118.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/fagojarejolaxukafupiko.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/luseropadaga.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210909_21AE0527A58AD485.pdfIn PDF document text
    • https://rrrc.us/userfiles/file/88409128752.pdfIn PDF document text
    • http://ginzaramen.us/uploads/files/bogegupaxaxoleban.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/4e980ae07bdc5b545a82bab188b61666/59299301730.pdfIn PDF document text
    • http://audidalys.lt/ckfinder/userfiles/files/gosoreferowexofakilerun.pdfIn PDF document text
    • http://synergienetwork.net/userfiles/file/latepivogunumafolesun.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210904_B8829D7A2A81FDFB.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ee2f11441---xilosurumekupubopoda.pdfIn PDF document text
    • http://camberwelltaxi.com/survey/userfiles/files/susedez.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021913023591661.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/sinume.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/59813274672.pdfIn PDF document text
    • http://dogable.de/userfiles/file/35088698521.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/10973288462.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/zereta.pdfIn PDF document text
    • http://bestorkate.com/uploads/ckeditor/files/xowajagudoz.pdfIn PDF document text
    • http://rayanchem.com/d/files/fijagalobuxapaxovore.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/95625214003.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/27941202626.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161355aa19f199---velamorivudobepimi.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_off0000d086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD086 19116 bytes
SHA-256: 898ca63d8e611d0bcd2c0e363c2bca55fcbeb8465864699a17558b2eaac75f70
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 10804 bytes
SHA-256: 00389a3539b0ea3c05a444646b19dce1274e1a0b8679ca84d3ee04c9165c7d58
font_02_sfnt_off00011abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ABE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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