Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e218e524fafe598…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 17:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 988aac421f2a2e2b404c133292741e5c SHA-1: 31d6f5af2e35fdc9238b5876c29ec6a28f76e56a SHA-256: 4e218e524fafe598589f01e4d3abcf6f06760f38a5a74cbbb9612e978ee611c2
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farm heuristics indicates a likely phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/589fc8af45bfeb68ac7bb4d7c7ee03a0/vidide.pdf In PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/440bf60d1271a6fdf1b398439b0f1142/3631542097.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/bajosuzadikiripesawo.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607715856f25b---nowibo.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070803453349.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/62364915425.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/betilir.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c93f7bc13---xuzovofuropaseruk.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/45812014079.pdfIn PDF document text
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/97beb5e876c05afe0b0272ae074b9e75/sobexibanetezenus.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ace3a935297---4548426308.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/suzor.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e11c5a269---35271813057.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f3f8ebf18---11489497549.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/90089268160.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/9d6318571e16034ad1ba128b957c6744/fedawuf.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/30468659243.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087010a9d582---bikudubukazopivox.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/e04f5710f7b109794b6884eb2d840c50/xuxir.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/gaxegovuzo.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/73618940829.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607da22c817f2---jonolokanifagirepakufejo.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/bvmqkkv43ef99gbim9ouabg0cl/paxalivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+you+make+tnt+in+gardenscapesPDF 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_off0000e81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE81D 11196 bytes
SHA-256: bd17b0d3e0e714e399fb3c16b200d72d837cc811ba497b74ed8c07d2946be51f
font_01_sfnt_off00010224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10224 17424 bytes
SHA-256: f34ef7e7a3cf5770862b0b2540b5990213b5045e136f162daabb81da5bcba99a
font_02_sfnt_off00012fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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