Malicious PDF — malware analysis report

Static analysis result for SHA-256 d892e0d48b5fb43e…

MALICIOUS

PDF

69.7 KB Created: 2021-10-07 21:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 586f62c0687c74a922dda80fe9ddf31e SHA-1: e5a9da9b33c187e4ccb7d3e489389a92f07a3783 SHA-256: d892e0d48b5fb43efb041a239214b469a091e1079d9e5b41b7cc37ee0031a942
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised websites or disposable domains, suggesting it's used as a link farm. The primary purpose appears to be directing users to potentially harmful external resources, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://demo755.webbazaar.com/uploads/gojokifovijopivudut.pdf In PDF document text
    • http://daimarconstrucciones.com/images/admin/file/pikibarimezodum.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/24058588813.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/noboxilixekigu.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368e458fb43---45989119754.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/74850315285.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b182cc0b7c---7213122427.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/64552316891.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/sujawatin.pdfIn PDF document text
    • http://rotang.net/userfiles/file/329039037.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-7/20210907164903545641.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/5df8860294330325475f0c4eccfe7443/wenadovixotiwimivino.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/fereguletup.pdfIn PDF document text
    • https://seikai.jp/free_images/files/43398270218.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141282387bfb---soxuruxuv.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/rurovenerasetakipira.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/loferurofapot.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/86b6b84bc30d4e52778aa6b10bf19085/lonaki.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/993522b32a66cdbce9b6e4b037ff7aa1/jenusapivokizupi.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/41493165927.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/4555312533.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/sepunajopulij.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1615096a46d6ef---82349807226.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=the+great+and+the+goodPDF 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_off0000b479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB479 15100 bytes
SHA-256: a8db06f709450845954c900bc33e8cf96c5e5d5a0c876380efe984af46f95478
font_01_sfnt_off0000da67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA67 10184 bytes
SHA-256: 7cbe640368c91783000570ff8ed5be88c3184eba1f773ef7b889cb362280b5be
font_02_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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