Malicious PDF — malware analysis report

Static analysis result for SHA-256 b33f22b3163e81c0…

MALICIOUS

PDF

89.4 KB Created: 2021-08-28 17:54:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b93485a6fdf849a8fdc0d7824941040 SHA-1: ae00cd43f3304e8c40666222056c9a06acce8c9f SHA-256: b33f22b3163e81c0724279821eccfda4735d3ef62576140d213ca87caa4edc75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs point to compromised websites and link farms, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://irlanc.ru/uplcv?utm_term=fundamentals+of+management+science PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609836e1223f5---tumopovazik.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210730_F9CAC027A5B22463.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210713035945091.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/3607732cd546c06a39617045e4a28004/xewedugowitazulolidepof.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c419ba3cf13---vejuxesakotexa.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/xetogiriserisaperofimo.pdfIn PDF document text
    • https://ivanamihic.com//files/wodatirapapagibuwa.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/miguruninegujatipuliteko.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/1293606737.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/j7vt514cqi62clgrjepq4fsss3/fogegexagaba.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/nifugebagovosawajoxo.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/semodizadewazebizivi.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/xejefivafubopuviponuwad.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/56592551255.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/97638322729.pdfIn PDF document text
    • http://vamaconsulting.sk/userfiles/file/90608982184.pdfIn PDF document text
    • http://blackshirts1960.com/clients/876325/File/18722088807.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085b73a37e70---77165783837.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/5157718e0f0b21273174d2b9c2ab4796/10446730952.pdfIn PDF document text
    • http://gazetavk.ru/img/file/84425123774.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bba40a70---zolagozul.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160caf4c8a6c93---69064039550.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/4a41a573de6b141d112a34a019f1bfd4/60183966475.pdfIn PDF document text
    • https://doanhnghiepvietnam.org/img_duhoc/files/solato.pdfIn PDF document text
    • https://unitjaya.com/contents/files/92119466891.pdfIn PDF document text
    • https://0900107678.com/upload/file/temodazum.pdfIn PDF document text
    • 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_off0000f778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 10796 bytes
SHA-256: e8155576b2c833568822e950c7985bc1ff7aec124c5e03300903fd4db0bfec8d
font_02_sfnt_off00012833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12833 18308 bytes
SHA-256: 58131ccab15ab0f89dfa66b7b95493bf72a47027fbe20b312966f235b11c4d4f

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