Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfedf4b149aeaf0c…

MALICIOUS

PDF

88.2 KB Created: 2021-07-24 17:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aa4147ee3206fcb537216a5d1d5d4efe SHA-1: ab53582bd176be8bfc77e2856a72976e247b65a1 SHA-256: dfedf4b149aeaf0cdb22eb55e80172a60e32b38f883b7dee70ff81efb6dbbbc0
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution attempt. The presence of multiple distinct hosts and the use of UTM parameters in some URLs indicate an effort to obscure the true destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5060bbf70---fowasigogukulizakiwekizu.pdf In PDF document text
    • http://www.puhito.hu/uploads/jelamirelemebakozol.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0d34dd41---46821731679.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0a942b6fec61d78a8486518f192241a8/90938511178.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/78114763378.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/91182171584.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a947fca11fa---15748512957.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/58130971307.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/fovafexenubupavakum.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/61703103819.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f6e4f2d95---terawatuteneta.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f214726c10---30939306087.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160a9373933d36---bogomiwuset.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/cdmb1r8itmvc6pu0k1iml47hne/kuviwobifog.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/b8be0b6e4562a77f4d6bc4398b8980c3/nezewalaxogijevomagotex.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/53487084739.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8d0dbd40a---72720379754.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/50871341500.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/fbbf623620d9196ca7571f7f6d9b6d4f/36655699794.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/37843818632.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/pop85lbc95s70r987ci3joebn0/govidil.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/filevigipepopomuto.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/7264320246.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=preguntas+y+respuestas+sobre+el+cuento+una+rosa+para+emilyPDF 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_off0000f04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04B 11072 bytes
SHA-256: 245b9a1663b560cc3257e948aad650a699262447fa1ed91e54fc24b4d450b537
font_01_sfnt_off000109e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E8 18556 bytes
SHA-256: 902b15b3410daa0c07de034c546bfbd6e4d6035135eae739df4d46d3c1e356f5
font_02_sfnt_off00013927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13927 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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