Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a22061048c0334…

MALICIOUS

PDF

75.1 KB Created: 2021-09-02 18:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3d9a9f7130e579e9bd516f1079e7cb5e SHA-1: 1d364c6ec3460562fef19980b4c6d8f322d6446d SHA-256: d1a22061048c0334a53ebdf191daabc77c59c34e6d049f997dd57c19bbdad021
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the PDF functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/tizofepep.pdf In PDF document text
    • https://nbcmedia.vn/ckfinder/userfiles/files/nifawaroniluta.pdfIn PDF document text
    • http://slsnn.ru/content/file/64796353586.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/66298039001.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/b3c66nhb84hmgglg7nbg53vl9u/lavamobafozar.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/gufamekebusiwok.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/9c456f426eef6a2880862606936bc627/93341729522.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210815040115.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/49551596950.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/94803710a85f9b72cae1b1301713306c/31831569787.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/1fec973f332aed01c62e3b7ba55a921a/tujodixesan.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/zelugevalududuwenikagim.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/87108427109.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/tanerunanidus.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/96761919100.pdfIn PDF document text
    • https://successalpha.team/upload/files/kipasewadinifi.pdfIn PDF document text
    • http://pelesiuvalymas.lt/i/File/52093575689.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/44109755060.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/a77e298e148a8c06b3befeab7c72ea5a/12659011386.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/83133356779.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1fb5f40f---weravowiwokomagudusik.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/padugokatej.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab947b6d7d8---74593832006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=beeswing+tab+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_off0000c073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC073 10684 bytes
SHA-256: ffabc194c07e5aa68d291210069750945e7c9627e80c6b6473352b87c3121f45
font_01_sfnt_off0000d8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D8 17808 bytes
SHA-256: 83ade973087e76024f9a01d88cd0f4237b1900787e0a09cdf8c662ad4daa5511

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