Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d9cab9b194039df…

MALICIOUS

PDF

76.0 KB Created: 2021-09-04 05:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bcaf3f6a32feb808b8c32c30d732a6e1 SHA-1: 3ba6107c4d15c3caa3eadb1de80f7c0bc16bfb0a SHA-256: 5d9cab9b194039dff7d7f027472db68e4d7d5c11d1be7fea8611c290c0b82d1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://allamericannursing.com/userfiles/file/79598235059.pdf In PDF document text
    • http://jocoseatee.com/userfiles/files/xotebodatotifokakujo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608801ae8fe8a---88947364701.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/11557279258.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/lofojukagafil.pdfIn PDF document text
    • http://soldresold.com/Shradhdha-Mehra/soldresold/final/ckeditorimage/files/60523026207.pdfIn PDF document text
    • http://ingmontagna.com/userfiles/files/fudexiva.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/89302426792.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/gumabu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f86f1fd23---numaroganu.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/16271141797.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/20235800334.pdfIn PDF document text
    • http://nepodoshlo.kz/ckfinder/userfiles/files/80877381019.pdfIn PDF document text
    • https://auto826.com/uploads/files/61344842383.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/notetu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b2957b194ef---53963463542.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/pevases.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/19996044954.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/bn95nu6i744ncaankio06ctdi2/26726491519.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6a2e086f61205e7d0889afde749d03ab/fazep.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/wirabu.pdfIn PDF document text
    • https://menu2uplus.com/images/file/buvavijokubemogujabi.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/kodakad.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/pikuwaridit.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/2e8b7bbfe88099a7de907b52ae2e4a4f/1685375658.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/xudoderibuku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cubs+broadcast+schedule+2018+pdfPDF 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_off0000c04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC04B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85D 18016 bytes
SHA-256: 71e605e6d8287f7b0d845625fd74c03d5653b17db16b5a32771a09f943b8827f
font_02_sfnt_off0001062e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062E 11292 bytes
SHA-256: d1feb080bd4eeab7c2f80063db50c034b2637a5aab6505cdb907ba53f9432249

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