Malicious PDF — malware analysis report

Static analysis result for SHA-256 3253f2292cc108b0…

MALICIOUS

PDF

81.7 KB Created: 2021-09-02 00:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8236922e0a1ebcc040307417a95faa0a SHA-1: 8f88719d85be6cf08561215ccf12b727dd07995f SHA-256: 3253f2292cc108b0aa7239978a95a4e93b5d2e1e121867f6fcb95f5eba4874f2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The embedded URLs and the PDF's structure strongly suggest an attempt to trick users into visiting malicious web content.

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://catamma.ru/uplcv?utm_term=the+pearl+that+broke+its+shell+pdf+free+download PDF link annotation
    • http://liebherr-tr.com/userfiles/file/wolorojon.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/vizugi.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/70581029507.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160989fc6e8c37---82936980925.pdfIn PDF document text
    • http://gurukripapublicschool.org/userfiles/file/wadazuporotazozotobow.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/43825605940.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021082206074160.pdfIn PDF document text
    • http://chayka-svg.ru/files/rozofurojodexarunozididi.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/6727089281.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b2148d05a40---zamavoxejuwutup.pdfIn PDF document text
    • http://kleiberit.ru/files/file/xomunofa.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/4fogrhc8n3vjd5svcblmpbnqp5/kagigumated.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fa400d5abc9---38157289418.pdfIn PDF document text
    • http://semihkerpiccilervesupersound.com/upload/file/29935102640.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4260a942df---lukezupab.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/nogoxu.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/kejixiv.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/8fabc546baed1e1760a8821518b4adaf/menudi.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/sepok.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021080818433941.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ca39cfcab---lovatagowuxom.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607856d8c496c---womizorowarotivivoz.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d97d93b9fa95375649c05f6d20715a2f/lisowemafoziburafisozij.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_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 10876 bytes
SHA-256: 2e7c5cd5cc7919dede7045caffbf78a2d4c6a039453e8e2af87d0543f7b83854
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 15792 bytes
SHA-256: ea162918c76386eae080f06e4790c7c9b1cf3e81d135def050d033469e158a43
font_02_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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