Malicious PDF — malware analysis report

Static analysis result for SHA-256 e768b1cc446887ba…

MALICIOUS

PDF

74.7 KB Created: 2021-07-16 20:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 038d4b74c9145fa887a0047414658eda SHA-1: 94d4330b09cea32d16353e5ddee2ab90a3e465e0 SHA-256: e768b1cc446887ba857e26d631e632fc77ce1e37013f7b70c6c6f3726281620c
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to distribute further malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://china-glass-mosaic.com/userfiles/files/20210609_180621.pdf In PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089c1ed066fd---28916606892.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16085e57b5173d---73663289468.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/62094147098.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095c6f21013c---suxoruwifumapugojigobikeg.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ceeuhb7a8l477kfgfjcfu5i0e6/23661046528.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/2e1b5a1794ee096678b21f6d225959f1/jolej.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/0efc1d27880d506b7963b27e807f3634/rilulosugazuripo.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d568168582---19421736393.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/vaxegajig.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/jfmhauot57fpjdoe7ouihhuqs0/bafazujenamitoxi.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608fabec13131---17598244419.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/ee1a76287f78acca5f2c464bfd57ea7b/52577208025.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/jidepex.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/0a2d712c78e426e2e66bb042b3bf9695/zizimuvajagiv.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/bqpnu1lb2d2ri1ie4c6ttc7egn/dovajitimi.pdfIn PDF document text
    • http://stroi-sistema.ru/img/vaniwazodisunimawenidex.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/9feda43d1dbe6e0f84042ec40e7a9c9a/jenadu.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607335f393731---77071074462.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e77e17aca---49139766637.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/39475487334.pdfIn PDF document text
    • http://shihtzufurbabies.net/clients/d/d3/d383cf0c90cf2d2391705d5438694b4c/File/77924028526.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ir1jrlj9avgbokel0j65ajrr9s/jitifogadarojarofowu.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/tazariwusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=current+weather+chapel+hill+ncPDF 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_off0000c22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22D 10400 bytes
SHA-256: 08e724b8447ef3e44a2afb8c71876a1ca4629686c5e14606db6217453e954faf
font_01_sfnt_off0000d9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9AC 16708 bytes
SHA-256: 5fe2dd92711ecc2627a85573cfa94ee893f1612b65c64166989de1d040dacbd8
font_02_sfnt_off00010547.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10547 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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